diff --git a/.hgtags b/.hgtags
index c5384838fc28..84d3f9cc49b8 100644
--- a/.hgtags
+++ b/.hgtags
@@ -4,3 +4,4 @@ df7a3c8ffeeaba229067efee5a20e21dae0dd877 MOZILLA_1_9_a4_BASE
 caeba7562e495a9f604984df0b48b6f99bec3e2e FENNEC_M4
 9d9941eacb14827fdab4716710042fdde84eb60d FIREFOX_3_1a1_RELEASE
 9d9941eacb14827fdab4716710042fdde84eb60d FIREFOX_3_1a1_BUILD1
+c1d7e318a27574c995631fec166ad42672475702 FIREFOX_3_1a1_BUILD2