diff -r 383be02a85eb -r 7d5640606813 virtualenv/sync/res/res_create_env.py
--- a/virtualenv/sync/res/res_create_env.py	Fri May 25 12:55:52 2012 +0200
+++ b/virtualenv/sync/res/res_create_env.py	Fri May 25 16:33:16 2012 +0200
@@ -10,6 +10,7 @@
     ('PYCRYPTO', 'pip', None, None),
     ('SSH', 'pip', None, None),
     ('FABRIC', 'pip', None, None),
+    ('MERCURIAL', 'pip', None, None),
 ]
 
 def generate_install_methods(path_locations, src_base, Logger, call_subprocess):