diff --git a/README.md b/README.md
index 691150a4..e6817d3e 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Functional examples are included in the
 | force\_destroy | Optional map of lowercase unprefixed name => boolean, defaults to false. | `map(bool)` | `{}` | no |
 | hmac\_key\_admins | IAM-style members who will be granted roles/storage.hmacKeyAdmin on all buckets. | `list(string)` | `[]` | no |
 | labels | Labels to be attached to the buckets | `map(string)` | `{}` | no |
-| lifecycle\_rules | List of lifecycle rules to configure. Format is the same as described in provider documentation https://www.terraform.io/docs/providers/google/r/storage_bucket.html#lifecycle_rule except condition.matches\_storage\_class should be a comma delimited string. | <pre>set(object({<br>    # Object with keys:<br>    # - type - The type of the action of this Lifecycle Rule. Supported values: Delete and SetStorageClass.<br>    # - storage_class - (Required if action type is SetStorageClass) The target Storage Class of objects affected by this Lifecycle Rule.<br>    action = map(string)<br><br>    # Object with keys:<br>    # - age - (Optional) Minimum age of an object in days to satisfy this condition.<br>    # - created_before - (Optional) Creation date of an object in RFC 3339 (e.g. 2017-06-13) to satisfy this condition.<br>    # - with_state - (Optional) Match to live and/or archived objects. Supported values include: "LIVE", "ARCHIVED", "ANY".<br>    # - matches_storage_class - (Optional) Comma delimited string for storage class of objects to satisfy this condition. Supported values include: MULTI_REGIONAL, REGIONAL, NEARLINE, COLDLINE, STANDARD, DURABLE_REDUCED_AVAILABILITY.<br>    # - num_newer_versions - (Optional) Relevant only for versioned objects. The number of newer versions of an object to satisfy this condition.<br>    condition = map(string)<br>  }))</pre> | `[]` | no |
+| lifecycle\_rules | List of lifecycle rules to configure. Format is the same as described in provider documentation https://www.terraform.io/docs/providers/google/r/storage_bucket.html#lifecycle_rule except condition.matches\_storage\_class should be a comma delimited string. | <pre>set(object({<br>    # Object with keys:<br>    # - type - The type of the action of this Lifecycle Rule. Supported values: Delete and SetStorageClass.<br>    # - storage_class - (Required if action type is SetStorageClass) The target Storage Class of objects affected by this Lifecycle Rule.<br>    action = map(string)<br><br>    # Object with keys:<br>    # - age - (Optional) Minimum age of an object in days to satisfy this condition.<br>    # - created_before - (Optional) Creation date of an object in RFC 3339 (e.g. 2017-06-13) to satisfy this condition.<br>    # - with_state - (Optional) Match to live and/or archived objects. Supported values include: "LIVE", "ARCHIVED", "ANY".<br>    # - matches_storage_class - (Optional) Comma delimited string for storage class of objects to satisfy this condition. Supported values include: MULTI_REGIONAL, REGIONAL, NEARLINE, COLDLINE, STANDARD, DURABLE_REDUCED_AVAILABILITY.<br>    # - num_newer_versions - (Optional) Relevant only for versioned objects. The number of newer versions of an object to satisfy this condition.<br>    # - days_since_custom_time - (Optional) The number of days from the Custom-Time metadata attribute after which this condition becomes true.<br>    condition = map(string)<br>  }))</pre> | `[]` | no |
 | location | Bucket location. | `string` | `"EU"` | no |
 | logging | Map of lowercase unprefixed name => bucket logging config object. Format is the same as described in provider documentation https://www.terraform.io/docs/providers/google/r/storage_bucket.html#logging | `any` | `{}` | no |
 | names | Bucket name suffixes. | `list(string)` | n/a | yes |
diff --git a/main.tf b/main.tf
index dddedcb3..573d5d7d 100644
--- a/main.tf
+++ b/main.tf
@@ -96,11 +96,12 @@ resource "google_storage_bucket" "buckets" {
         storage_class = lookup(lifecycle_rule.value.action, "storage_class", null)
       }
       condition {
-        age                   = lookup(lifecycle_rule.value.condition, "age", null)
-        created_before        = lookup(lifecycle_rule.value.condition, "created_before", null)
-        with_state            = lookup(lifecycle_rule.value.condition, "with_state", lookup(lifecycle_rule.value.condition, "is_live", false) ? "LIVE" : null)
-        matches_storage_class = contains(keys(lifecycle_rule.value.condition), "matches_storage_class") ? split(",", lifecycle_rule.value.condition["matches_storage_class"]) : null
-        num_newer_versions    = lookup(lifecycle_rule.value.condition, "num_newer_versions", null)
+        age                    = lookup(lifecycle_rule.value.condition, "age", null)
+        created_before         = lookup(lifecycle_rule.value.condition, "created_before", null)
+        with_state             = lookup(lifecycle_rule.value.condition, "with_state", lookup(lifecycle_rule.value.condition, "is_live", false) ? "LIVE" : null)
+        matches_storage_class  = contains(keys(lifecycle_rule.value.condition), "matches_storage_class") ? split(",", lifecycle_rule.value.condition["matches_storage_class"]) : null
+        num_newer_versions     = lookup(lifecycle_rule.value.condition, "num_newer_versions", null)
+        days_since_custom_time = lookup(lifecycle_rule.value.condition, "days_since_custom_time", null)
       }
     }
   }
diff --git a/variables.tf b/variables.tf
index 5dd9dc6b..05b3c286 100644
--- a/variables.tf
+++ b/variables.tf
@@ -182,6 +182,7 @@ variable "lifecycle_rules" {
     # - with_state - (Optional) Match to live and/or archived objects. Supported values include: "LIVE", "ARCHIVED", "ANY".
     # - matches_storage_class - (Optional) Comma delimited string for storage class of objects to satisfy this condition. Supported values include: MULTI_REGIONAL, REGIONAL, NEARLINE, COLDLINE, STANDARD, DURABLE_REDUCED_AVAILABILITY.
     # - num_newer_versions - (Optional) Relevant only for versioned objects. The number of newer versions of an object to satisfy this condition.
+    # - days_since_custom_time - (Optional) The number of days from the Custom-Time metadata attribute after which this condition becomes true.
     condition = map(string)
   }))
   description = "List of lifecycle rules to configure. Format is the same as described in provider documentation https://www.terraform.io/docs/providers/google/r/storage_bucket.html#lifecycle_rule except condition.matches_storage_class should be a comma delimited string."