diff --git a/.hgtags b/.hgtags
index 4d11c256c..fff235f85 100644
--- a/.hgtags
+++ b/.hgtags
@@ -13,3 +13,4 @@ b5bf2588cde2f1273b1095cc5c83a0c272e55370 release ns-3.0.10
 ee5e1da76ecc52337f097cd90ebb50a3d49ec541 release-3.0.11
 b17f2928291eec5bf5b1c59a4a5fd583f704ac40 release ns-3.0.12
 79dba133b5f8a2d6f6f678a22e8519bc155e6a4e release ns-3.0.13
+8869a79a391f49d0c787f0558cc9329b4e7ee40e release candidate ns-3.1-RC1