diff --git a/IPython/core/release.py b/IPython/core/release.py
index 6f27f56..f5085d4 100644
--- a/IPython/core/release.py
+++ b/IPython/core/release.py
@@ -23,7 +23,7 @@ _version_major = 4
 _version_minor = 1
 _version_patch = 0
 _version_extra = '.dev'
-# _version_extra = 'rc1'
+_version_extra = 'rc1'
 # _version_extra = ''  # Uncomment this for full releases
 
 # release.codename is deprecated in 2.0, will be removed in 3.0