diff -r 142d2a4cb69a -r 5830efce522b mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Sun Feb 09 15:50:36 2020 -0500
+++ b/mercurial/cmdutil.py	Sun Feb 09 16:18:26 2020 -0500
@@ -209,7 +209,7 @@
             b'p',
             b'show-function',
             None,
-            _(b'show which function each change is in'),
+            _(b'show which function each change is in (DEFAULT: diff.showfunc)'),
         ),
         (b'', b'reverse', None, _(b'produce a diff that undoes the changes')),
     ]