diff --git a/doc/en/reference/reference.rst b/doc/en/reference/reference.rst
index d08269725..69e8690e7 100644
--- a/doc/en/reference/reference.rst
+++ b/doc/en/reference/reference.rst
@@ -1130,6 +1130,9 @@ Custom warnings generated in some situations such as improper usage or deprecate
 .. autoclass:: pytest.PytestExperimentalApiWarning
    :show-inheritance:
 
+.. autoclass:: pytest.PytestReturnNotNoneWarning
+  :show-inheritance:
+
 .. autoclass:: pytest.PytestUnhandledCoroutineWarning
    :show-inheritance: