diff --git a/.hgtags b/.hgtags
index 699436ea3..157bc17ac 100644
--- a/.hgtags
+++ b/.hgtags
@@ -27,3 +27,4 @@ f33cbf6b051c51d92db41b6fa825437958fbf801 ns-3.3-RC1
 a84f2ab246e691a88b527a84ce21896b95080070 ns-3.3-RC1
 654eed5f3ad03c04c2bcfb6852b5b4ae94260bc6 ns-3.3-RC2
 a66553c56a8f14644af6c229c83bb0a653cb3f32 ns-3.3-RC3
+dfd0bc16dc991313896f351530a3dc5a25f62e15 ns-3.3-RC4