--- a/mercurial/commands.py	Wed May 11 01:56:59 2016 +0000
+++ b/mercurial/commands.py	Tue May 17 11:28:46 2016 -0500
@@ -4590,7 +4590,7 @@
     subtopic = None
     if name and '.' in name:
         name, section = name.split('.', 1)
-        section = section.lower()
+        section = encoding.lower(section)
         if '.' in section:
             subtopic, section = section.split('.', 1)
         else: