diff --git a/.hgignore b/.hgignore
index 37ca46e..0a06a5d 100644
--- a/.hgignore
+++ b/.hgignore
@@ -13,4 +13,5 @@ coverage/
 htmlcov/
 _build/
 dist/
-MANIFEST
\ No newline at end of file
+MANIFEST
+.tox