diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -485,7 +485,7 @@
         return aliasargs(self.fn, args)
 
     def __getattr__(self, name):
-        adefaults = {r'norepo': True,
+        adefaults = {r'norepo': True, r'hiddenlevel': 0,
                      r'optionalrepo': False, r'inferrepo': False}
         if name not in adefaults:
             raise AttributeError(name)
diff --git a/mercurial/registrar.py b/mercurial/registrar.py
--- a/mercurial/registrar.py
+++ b/mercurial/registrar.py
@@ -148,6 +148,9 @@
         func.norepo = norepo
         func.optionalrepo = optionalrepo
         func.inferrepo = inferrepo
+        if hiddenlevel not in set([0, 1, 2]):
+            hiddenlevel = 0
+        func.hiddenlevel = hiddenlevel
         if synopsis:
             self._table[name] = func, list(options), synopsis
         else: