diff --git a/.gitignore b/.gitignore
index 489fe3017..900f8703c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,7 @@ dist/*
 doc/source/api/*
 doc/build/*
 api-guide/build/*
+api-ref/build/*
 etc/nova/nova.conf.sample
 instances
 keeper