update 1.15.1 changelog

Author: austinvalle

.changes/1.15.1.md

@@ -1,5 +1,9 @@
 ## 1.15.1 (July 31, 2025)
 
+NOTES:
+
+* This release contains a change in behavior for the `UseStateForUnknown` plan modifier, which will now preserve null values from prior state for unconfigured attributes. This updated version can cause plan inconsistency errors when used on child attributes of a nested attribute that expect `UseStateForUnknown` to keep the child attributes on new nested objects as `<unknown>` (known after apply). See [#1197](https://github.com/hashicorp/terraform-plugin-framework/issues/1197) for more details.
+
 BUG FIXES:
 
 * all: Fixed bug with `UseStateForUnknown` where known null state values were not preserved during update plans. ([#1117](https://github.com/hashicorp/terraform-plugin-framework/issues/1117))

CHANGELOG.md

@@ -63,6 +63,10 @@ BUG FIXES:
 
 ## 1.15.1 (July 31, 2025)
 
+NOTES:
+
+* This release contains a change in behavior for the `UseStateForUnknown` plan modifier, which will now preserve null values from prior state for unconfigured attributes. This updated version can cause plan inconsistency errors when used on child attributes of a nested attribute that expect `UseStateForUnknown` to keep the child attributes on new nested objects as `<unknown>` (known after apply). See [#1197](https://github.com/hashicorp/terraform-plugin-framework/issues/1197) for more details.
+
 BUG FIXES:
 
 * all: Fixed bug with `UseStateForUnknown` where known null state values were not preserved during update plans. ([#1117](https://github.com/hashicorp/terraform-plugin-framework/issues/1117))