diff --git a/.hgignore b/.hgignore
index 37dffdb..d88b97b 100644
--- a/.hgignore
+++ b/.hgignore
@@ -71,6 +71,7 @@ ess/NEWS
 ess/ONEWS
 ess/doc/ess.pdf
 ess/doc/readme.pdf
+ess/doc/html/
 
 apel.cvs/
 flim.cvs/