diff --git a/src/wp-includes/class-wp-theme-json.php b/src/wp-includes/class-wp-theme-json.php
index 369c110a31ed3..c4e83924b4e34 100644
--- a/src/wp-includes/class-wp-theme-json.php
+++ b/src/wp-includes/class-wp-theme-json.php
@@ -1012,6 +1012,7 @@ public function get_settings() {
 	 *
 	 * @since 5.8.0
 	 * @since 5.9.0 Removed the `$type` parameter, added the `$types` and `$origins` parameters.
+	 * @since 6.3.0 Add fallback layout styles for Post Template when block gap support isn't available.
 	 *
 	 * @param string[] $types   Types of styles to load. Will load all by default. It accepts:
 	 *                          - `variables`: only the CSS Custom Properties for presets & custom ones.