--- a/mercurial/revlog.py	Tue Nov 19 18:38:17 2019 -0800
+++ b/mercurial/revlog.py	Mon Nov 25 11:53:50 2019 -0800
@@ -1279,7 +1279,7 @@
         return bool(self.reachableroots(a, [b], [a], includepath=False))
 
     def reachableroots(self, minroot, heads, roots, includepath=False):
-        """return (heads(::<roots> and <roots>::<heads>))
+        """return (heads(::(<roots> and <roots>::<heads>)))
 
         If includepath is True, return (<roots>::<heads>)."""
         try: