diff --git a/.hgtags b/.hgtags
index 74985ab1..58c0b5ce 100644
--- a/.hgtags
+++ b/.hgtags
@@ -461,3 +461,5 @@ e92f2c2af57c7f0127bb83477b146c91ce1b5ae2 FENNEC_14_0b3_RELEASE
 3d51cdbaf23ce973b46f5f145a9f0a07c38a3bc2 FENNEC_14_0b3_BUILD2
 daf618bd1c648c6611282a4b3d0e43690184480b FIREFOX_13_0b6_RELEASE
 daf618bd1c648c6611282a4b3d0e43690184480b FIREFOX_13_0b6_BUILD1
+a4c0bdcb2e61add63e6515c8903a77e9e853bade THUNDERBIRD_13_0b4_RELEASE
+a4c0bdcb2e61add63e6515c8903a77e9e853bade THUNDERBIRD_13_0b4_BUILD1