diff --git a/.changelog/39578.txt b/.changelog/39578.txt
index 6e575f8f03e..a4b4dc02c3d 100644
--- a/.changelog/39578.txt
+++ b/.changelog/39578.txt
@@ -1,3 +1,7 @@
 ```release-note:enhancement
 resource/aws_s3_bucket_lifecycle_configuration: Add `transition_default_minimum_object_size` argument
+```
+
+```release-note:note
+resource/aws_s3_bucket_lifecycle_configuration: Amazon S3 now applies a default minimum object size of 128 KB for S3 Lifecycle transition rules to any S3 storage class. This new default behavior will be applied to any new or modified S3 Lifecycle configuration. You can override this new default and customize the minimum object size for S3 Lifecycle transition rules to any value.
 ```
\ No newline at end of file
diff --git a/website/docs/r/s3_bucket_lifecycle_configuration.html.markdown b/website/docs/r/s3_bucket_lifecycle_configuration.html.markdown
index 9a6a0a0783a..b8110b35209 100644
--- a/website/docs/r/s3_bucket_lifecycle_configuration.html.markdown
+++ b/website/docs/r/s3_bucket_lifecycle_configuration.html.markdown
@@ -367,7 +367,7 @@ This resource supports the following arguments:
 * `bucket` - (Required) Name of the source S3 bucket you want Amazon S3 to monitor.
 * `expected_bucket_owner` - (Optional) Account ID of the expected bucket owner. If the bucket is owned by a different account, the request will fail with an HTTP 403 (Access Denied) error.
 * `rule` - (Required) List of configuration blocks describing the rules managing the replication. [See below](#rule).
-* `transition_default_minimum_object_size` - (Optional) Which default minimum object size behavior is applied to the lifecycle configuration. Valid values: `all_storage_classes_128K`, `varies_by_storage_class`. To customize the minimum object size for any transition you can add a `filter` that specifies a custom `object_size_greater_than` or `object_size_less_than` value. Custom filters always take precedence over the default transition behavior.
+* `transition_default_minimum_object_size` - (Optional) The default minimum object size behavior applied to the lifecycle configuration. Valid values: `all_storage_classes_128K` (default), `varies_by_storage_class`. To customize the minimum object size for any transition you can add a `filter` that specifies a custom `object_size_greater_than` or `object_size_less_than` value. Custom filters always take precedence over the default transition behavior.
 
 ### rule
 
@@ -445,7 +445,7 @@ The `transition` configuration block supports the following arguments:
 
 The `and` configuration block supports the following arguments:
 
-* `object_size_greater_than` - (Optional) Minimum object size to which the rule applies. Value must be at least `0` if specified. Defaults to 128000.
+* `object_size_greater_than` - (Optional) Minimum object size to which the rule applies. Value must be at least `0` if specified. Defaults to 128000 (128 KB) for all `storage_class` values unless `transition_default_minimum_object_size` specifies otherwise.
 * `object_size_less_than` - (Optional) Maximum object size to which the rule applies. Value must be at least `1` if specified.
 * `prefix` - (Optional) Prefix identifying one or more objects to which the rule applies.
 * `tags` - (Optional) Key-value map of resource tags. All of these tags must exist in the object's tag set in order for the rule to apply.