diff --git a/Lib/argparse.py b/Lib/argparse.py
index 47386ab..f9279aa 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -987,7 +987,7 @@
                  version=None,
                  dest=SUPPRESS,
                  default=SUPPRESS,
-                 help=None):
+                 help="show program's version number and exit"):
         super(_VersionAction, self).__init__(
             option_strings=option_strings,
             dest=dest,