diff --git a/google-cloud-storage/src/main/java/com/google/cloud/storage/BucketInfo.java b/google-cloud-storage/src/main/java/com/google/cloud/storage/BucketInfo.java
index 8c2d0aa4e8..43f9e58cfa 100644
--- a/google-cloud-storage/src/main/java/com/google/cloud/storage/BucketInfo.java
+++ b/google-cloud-storage/src/main/java/com/google/cloud/storage/BucketInfo.java
@@ -624,7 +624,9 @@ public Builder setMatchesStorageClass(List<StorageClass> matchesStorageClass) {
 
         /**
          * Sets the date in RFC 3339 format with only the date part (for instance, "2013-01-15").
-         * This condition is satisfied when the custom time on an object is before this date.
+         * Note that only date part will be considered, if the time is specified it will be
+         * truncated. This condition is satisfied when the custom time on an object is before this
+         * date in UTC.
          */
         public Builder setCustomTimeBefore(DateTime customTimeBefore) {
           this.customTimeBefore = customTimeBefore;