diff --git a/reference/forms/types/entity.rst b/reference/forms/types/entity.rst
index 6adaa9df79f..ec3dbc2eb70 100644
--- a/reference/forms/types/entity.rst
+++ b/reference/forms/types/entity.rst
@@ -284,6 +284,8 @@ type:
 
 .. include:: /reference/forms/types/options/attr.rst.inc
 
+.. include:: /reference/forms/types/options/by_reference.rst.inc
+
 .. include:: /reference/forms/types/options/data.rst.inc
 
 .. include:: /reference/forms/types/options/disabled.rst.inc