diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -8,3 +8,4 @@ 9a4aa6470987b8147bd875bd9779eea3f6072727
 e730ce1f2d31ab502530c4e41706559b31493d5a rd fick laws
 b5cc18bab69786675e756a5a478042c45cc558ae rd and growth
 ce40edbe6273c1821e1e5561cabe5c6191eb03b7 no vascular expansion
+bd77d1217180d16ee0ae0170346a93d77cb0a086 auxin upstream pumping