diff --git a/docs/release_notes/v0.5.1.rst b/docs/release_notes/v0.5.1.rst
index 09e750bfe..b3e961866 100644
--- a/docs/release_notes/v0.5.1.rst
+++ b/docs/release_notes/v0.5.1.rst
@@ -11,5 +11,7 @@ Minor changes
 -------------
 
 * Fixed a bug that allowed the posts count associated with each forum profile to be negative when deleting non-approved posts (`#44`_)
+* Removed Django warning related to the presence of the `on_delete` argument (`#45`_)
 
 .. _`#44`: https://github.com/ellmetha/django-machina/pull/44
+.. _`#45`: https://github.com/ellmetha/django-machina/pull/45