diff -r 15aef805619d -r 843418dc0b1b mercurial/help.py
--- a/mercurial/help.py	Sun Mar 29 15:29:39 2020 -0700
+++ b/mercurial/help.py	Sun Mar 29 14:22:07 2020 -0700
@@ -966,7 +966,7 @@
             doc = gettext(pycompat.getdoc(mod)) or _(b'no help text available')
         except KeyError:
             mod = None
-            doc = extensions.disabledext(name)
+            doc = extensions.disabled_help(name)
             if not doc:
                 raise error.UnknownCommand(name)