diff --git a/core/modules/system/templates/container.html.twig b/core/modules/system/templates/container.html.twig
index 167965c7c3dbf388a5f9df1751841a70d7e1ce20..b03cc8be1d14fa3a3ff2e19ee38b8315a695b7c0 100644
--- a/core/modules/system/templates/container.html.twig
+++ b/core/modules/system/templates/container.html.twig
@@ -3,8 +3,10 @@
* @file
* Default theme implementation of a container used to wrap child elements.
*
- * Used for grouped form items. Can also be used as a #theme_wrapper for any
+ * Used for grouped form items. Can also be used as a theme wrapper for any
* renderable element, to surround it with a
and HTML attributes.
+ * See the @link forms_api_reference.html Form API reference @endlink for more
+ * information on the #theme_wrappers render array property.
*
* Available variables:
* - attributes: HTML attributes for the containing element.
diff --git a/core/themes/classy/templates/form/container.html.twig b/core/themes/classy/templates/form/container.html.twig
index 5e5bce8c389657ceeaacea5ec6d889b34d2aaee6..3bd88ec25b28e7dae5691387f699619be3c3b6ca 100644
--- a/core/themes/classy/templates/form/container.html.twig
+++ b/core/themes/classy/templates/form/container.html.twig
@@ -3,8 +3,10 @@
* @file
* Theme override of a container used to wrap child elements.
*
- * Used for grouped form items. Can also be used as a #theme_wrapper for any
+ * Used for grouped form items. Can also be used as a theme wrapper for any
* renderable element, to surround it with a
and HTML attributes.
+ * See the @link forms_api_reference.html Form API reference @endlink for more
+ * information on the #theme_wrappers render array property.
*
* Available variables:
* - attributes: HTML attributes for the containing element.