diff --git a/src/wp-includes/interactivity-api/class-wp-interactivity-api.php b/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
index 0ee2ba8eff20c..095f12380dfbe 100644
--- a/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
+++ b/src/wp-includes/interactivity-api/class-wp-interactivity-api.php
@@ -138,8 +138,8 @@ final class WP_Interactivity_API {
 	 * @since 6.5.0
 	 * @since 6.6.0 The `$store_namespace` param is optional.
 	 *
-	 * @param string $store_namespace Optional. The unique store namespace identifier.
-	 * @param array  $state           Optional. The array that will be merged with the existing state for the specified
+	 * @param string|null $store_namespace Optional. The unique store namespace identifier.
+	 * @param array|null  $state           Optional. The array that will be merged with the existing state for the specified
 	 *                                store namespace.
 	 * @return array The current state for the specified store namespace. This will be the updated state if a $state
 	 *               argument was provided.
@@ -311,7 +311,7 @@ public function filter_script_module_interactivity_data( array $data ): array {
 	 *
 	 * @since 6.6.0
 	 *
-	 * @param string $store_namespace Optional. The unique store namespace identifier.
+	 * @param string|null $store_namespace Optional. The unique store namespace identifier.
 	 */
 	public function get_context( ?string $store_namespace = null ): array {
 		if ( null === $this->context_stack ) {
diff --git a/src/wp-includes/interactivity-api/interactivity-api.php b/src/wp-includes/interactivity-api/interactivity-api.php
index 7fa803180552b..afdc4ccf4b3ae 100644
--- a/src/wp-includes/interactivity-api/interactivity-api.php
+++ b/src/wp-includes/interactivity-api/interactivity-api.php
@@ -53,8 +53,8 @@ function wp_interactivity_process_directives( string $html ): string {
  * @since 6.5.0
  * @since 6.6.0 The namespace can be omitted when called inside derived state getters.
  *
- * @param string $store_namespace The unique store namespace identifier.
- * @param array  $state           Optional. The array that will be merged with the existing state for the specified
+ * @param string|null $store_namespace The unique store namespace identifier.
+ * @param array       $state           Optional. The array that will be merged with the existing state for the specified
  *                                store namespace.
  * @return array The state for the specified store namespace. This will be the updated state if a $state argument was
  *               provided.
@@ -119,7 +119,7 @@ function wp_interactivity_data_wp_context( array $context, string $store_namespa
  *
  * @since 6.6.0
  *
- * @param string $store_namespace Optional. The unique store namespace identifier.
+ * @param string|null $store_namespace Optional. The unique store namespace identifier.
  * @return array The context for the specified store namespace.
  */
 function wp_interactivity_get_context( ?string $store_namespace = null ): array {