--- a/.hgtags
+++ b/.hgtags
@@ -1,2 +1,4 @@
 57ebead2e8add591fba3ee56706ce8a3bcb16bb6 release-2.5.0
+8bd1979150df28728ca1612cc28b435abbf93772 autopano-sift-C-2.5.1_rc1
 f13e55263a9c79d7d6944045055e85bc631d1968 start
+f7ce8a2be3f627d9226b134c8d9519894605f640 autopano-sift-C-2.5.1_rc2