diff --git a/docs/permissions/custom-rules.md b/docs/permissions/custom-rules.md
index dd11f4d773..7bfcd1220a 100644
--- a/docs/permissions/custom-rules.md
+++ b/docs/permissions/custom-rules.md
@@ -184,7 +184,7 @@ To install custom rules in a plugin, we need to use the [`PermissionsRegistrySer
      import('@backstage/plugin-catalog-backend-module-scaffolder-entity-model'),
    );
    /* highlight-add-next-line */
-   backend.add(import('./modules/catalogPermissionRules.ts'));
+   backend.add(import('./modules/catalogPermissionRules'));
    ```
 
 5. Now when you run you Backstage instance - `yarn start` - the rule will be added to the catalog plugin.