diff --git a/src/_pytest/outcomes.py b/src/_pytest/outcomes.py
index d2d2d13e6..0f64f91d9 100644
--- a/src/_pytest/outcomes.py
+++ b/src/_pytest/outcomes.py
@@ -112,8 +112,7 @@ def exit(
         only because `msg` is deprecated.
 
     :param returncode:
-        Return code to be used when exiting pytest.
-    :default returncode: None
+        Return code to be used when exiting pytest. None means the same as ``0`` (no error), same as :func:`sys.exit`.
 
     :param msg:
         Same as ``reason``, but deprecated. Will be removed in a future version, use ``reason`` instead.