diff --git a/.hgtags b/.hgtags
index b9d921f3..955724a3 100644
--- a/.hgtags
+++ b/.hgtags
@@ -258,3 +258,4 @@ a2cac2d900e399dd437ed2c41aa9691936a9baac FIREFOX_9_0_BUILD1
 8fd56caddadfb140233d400b83a928bde31bb936 FIREFOX_9_0_1_RELEASE
 14358a0776fbde3cc49f189c03e60b67b2aeabf5 FIREFOX_9_0_1_BUILD1
 20a68290691af95259682826029024b65ca36890 FENNEC_10_0b1_RELEASE
+39e13162b18f6cde18570cf28a217c04bd58c382 FENNEC_10_0b1_BUILD1