diff -r f10a0f5eedae -r 2da754532dd3 hgext/uncommit.py
--- a/hgext/uncommit.py	Sat Sep 14 23:41:31 2019 -0400
+++ b/hgext/uncommit.py	Sun Sep 15 00:07:30 2019 -0400
@@ -111,7 +111,8 @@
 @command('uncommit',
     [('', 'keep', None, _('allow an empty commit after uncommiting')),
      ('', 'allow-dirty-working-copy', False,
-    _('allow uncommit with outstanding changes'))
+    _('allow uncommit with outstanding changes')),
+     (b'n', b'note', b'', _(b'store a note on uncommit'), _(b'TEXT'))
     ] + commands.walkopts + commands.commitopts + commands.commitopts2
     + commands.commitopts3,
     _('[OPTION]... [FILE]...'),
@@ -129,6 +130,7 @@
     """
     opts = pycompat.byteskwargs(opts)
 
+    cmdutil.checknotesize(ui, opts)
     cmdutil.resolvecommitoptions(ui, opts)
 
     with repo.wlock(), repo.lock():