diff -r df881932362f -r 31177742f54a mercurial/extensions.py
--- a/mercurial/extensions.py	Tue Jul 14 20:24:16 2009 +0200
+++ b/mercurial/extensions.py	Mon Jul 13 09:50:26 2009 +0900
@@ -173,6 +173,6 @@
         doc = (gettext(ext.__doc__) or _('(no help text available)'))
         ename = ename.split('.')[-1]
         maxlength = max(len(ename), maxlength)
-        exts[ename] = doc.splitlines(0)[0].strip()
+        exts[ename] = doc.splitlines()[0].strip()
 
     return exts, maxlength