diff --git a/.hgtags b/.hgtags
index b65960bec..44513c3c7 100644
--- a/.hgtags
+++ b/.hgtags
@@ -29,3 +29,4 @@ a84f2ab246e691a88b527a84ce21896b95080070 ns-3.3-RC1
 a66553c56a8f14644af6c229c83bb0a653cb3f32 ns-3.3-RC3
 dfd0bc16dc991313896f351530a3dc5a25f62e15 ns-3.3-RC4
 58ae52c5845ff03ba08dc921e13e6cf3604c810a ns-3.3-RC5
+4267fd454004f5a60e517496f43a01000ccebc72 ns-3.3-RC6