diff --git a/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/Filter.java b/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/Filter.java
index 008c0137..17988c17 100644
--- a/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/Filter.java
+++ b/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/Filter.java
@@ -466,13 +466,16 @@ public com.google.protobuf.ByteString getProjectsBytes(int index) {
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -486,13 +489,16 @@ public com.google.protobuf.ProtocolStringList getCreditTypesList() {
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -506,13 +512,16 @@ public int getCreditTypesCount() {
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -527,13 +536,16 @@ public java.lang.String getCreditTypes(int index) {
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1588,13 +1600,16 @@ private void ensureCreditTypesIsMutable() {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1608,13 +1623,16 @@ public com.google.protobuf.ProtocolStringList getCreditTypesList() {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1628,13 +1646,16 @@ public int getCreditTypesCount() {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1649,13 +1670,16 @@ public java.lang.String getCreditTypes(int index) {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1670,13 +1694,16 @@ public com.google.protobuf.ByteString getCreditTypesBytes(int index) {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1698,13 +1725,16 @@ public Builder setCreditTypes(int index, java.lang.String value) {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1725,13 +1755,16 @@ public Builder addCreditTypes(java.lang.String value) {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1749,13 +1782,16 @@ public Builder addAllCreditTypes(java.lang.Iterable<java.lang.String> values) {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -1772,13 +1808,16 @@ public Builder clearCreditTypes() {
      *
      *
      * <pre>
-     * Optional. A list of credit types to be subtracted from gross cost to
-     * determine the spend for threshold calculations if and only if
-     * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-     * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-     * empty. See credits.type on
-     * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-     * for a list of acceptable credit type values in this field.
+     * Optional. If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+     * subtracted from gross cost to determine the spend for threshold
+     * calculations.
+     * If
+     * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+     * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+     * of acceptable credit type
+     * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
      * </pre>
      *
      * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
diff --git a/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/FilterOrBuilder.java b/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/FilterOrBuilder.java
index b1211c59..200705ce 100644
--- a/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/FilterOrBuilder.java
+++ b/proto-google-cloud-billingbudgets-v1/src/main/java/com/google/cloud/billing/budgets/v1/FilterOrBuilder.java
@@ -94,13 +94,16 @@ public interface FilterOrBuilder
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -112,13 +115,16 @@ public interface FilterOrBuilder
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -130,13 +136,16 @@ public interface FilterOrBuilder
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
@@ -149,13 +158,16 @@ public interface FilterOrBuilder
    *
    *
    * <pre>
-   * Optional. A list of credit types to be subtracted from gross cost to
-   * determine the spend for threshold calculations if and only if
-   * credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-   * credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-   * empty. See credits.type on
-   * https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-   * for a list of acceptable credit type values in this field.
+   * Optional. If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+   * subtracted from gross cost to determine the spend for threshold
+   * calculations.
+   * If
+   * [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+   * is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+   * of acceptable credit type
+   * values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
    * </pre>
    *
    * <code>repeated string credit_types = 7 [(.google.api.field_behavior) = OPTIONAL];</code>
diff --git a/proto-google-cloud-billingbudgets-v1/src/main/proto/google/cloud/billing/budgets/v1/budget_model.proto b/proto-google-cloud-billingbudgets-v1/src/main/proto/google/cloud/billing/budgets/v1/budget_model.proto
index 1cbdbd7b..a23e0801 100644
--- a/proto-google-cloud-billingbudgets-v1/src/main/proto/google/cloud/billing/budgets/v1/budget_model.proto
+++ b/proto-google-cloud-billingbudgets-v1/src/main/proto/google/cloud/billing/budgets/v1/budget_model.proto
@@ -190,13 +190,17 @@ message Filter {
   // Only zero or one project can be specified currently.
   repeated string projects = 1 [(google.api.field_behavior) = OPTIONAL];
 
-  // Optional. A list of credit types to be subtracted from gross cost to
-  // determine the spend for threshold calculations if and only if
-  // credit_types_treatment is INCLUDE_SPECIFIED_CREDITS. If
-  // credit_types_treatment is not INCLUDE_SPECIFIED_CREDITS, this field must be
-  // empty. See credits.type on
-  // https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#data-schema
-  // for a list of acceptable credit type values in this field.
+  // Optional. If
+  // [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+  // is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
+  // subtracted from gross cost to determine the spend for threshold
+  // calculations.
+  //
+  // If
+  // [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
+  // is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty. See [a list
+  // of acceptable credit type
+  // values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
   repeated string credit_types = 7 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. If not set, default behavior is `INCLUDE_ALL_CREDITS`.
diff --git a/synth.metadata b/synth.metadata
index 1337003c..98710db5 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -11,16 +11,16 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "a9dafb196ae8cf27ba8795efcc1944292ad92264",
-        "internalRef": "339511971"
+        "sha": "1f22d1e9654a2588aa32f3802156d965d8d1f10f",
+        "internalRef": "340738401"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "a9dafb196ae8cf27ba8795efcc1944292ad92264",
-        "internalRef": "339511971"
+        "sha": "1f22d1e9654a2588aa32f3802156d965d8d1f10f",
+        "internalRef": "340738401"
       }
     },
     {