diff --git a/src/_pytest/outcomes.py b/src/_pytest/outcomes.py
index a8984c5b9..d2d2d13e6 100644
--- a/src/_pytest/outcomes.py
+++ b/src/_pytest/outcomes.py
@@ -113,6 +113,7 @@ def exit(
 
     :param returncode:
         Return code to be used when exiting pytest.
+    :default returncode: None
 
     :param msg:
         Same as ``reason``, but deprecated. Will be removed in a future version, use ``reason`` instead.