diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -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')),
     ]
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -6646,7 +6646,7 @@
         (b'i', b'ignored', None, _(b'show only ignored files')),
         (b'n', b'no-status', None, _(b'hide status prefix')),
         (b't', b'terse', _NOTTERSE, _(b'show the terse output (EXPERIMENTAL)')),
-        (b'C', b'copies', None, _(b'show source of copied files')),
+        (b'C', b'copies', None, _(b'show source of copied files (DEFAULT: ui.statuscopies)')),
         (
             b'0',
             b'print0',