diff --git a/IPython/core/release.py b/IPython/core/release.py
index a2bef7f..592ae2d 100644
--- a/IPython/core/release.py
+++ b/IPython/core/release.py
@@ -22,8 +22,8 @@ name = 'ipython'
 _version_major = 1
 _version_minor = 0
 _version_patch = 0
-_version_extra = 'dev'
-#_version_extra = 'rc1'
+# _version_extra = 'dev'
+_version_extra = 'rc1'
 # _version_extra = ''  # Uncomment this for full releases
 
 codename = 'An Afternoon Hack'