diff --git a/.gitignore b/.gitignore
index 1673767b61bb..7cabc188896d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,7 @@ nova/vcsversion.py
 tools/conf/nova.conf*
 doc/source/_static/nova.conf.sample
 doc/source/_static/nova.policy.yaml.sample
+doc/source/_static/support-matrix.css
 
 # Files created by releasenotes build
 releasenotes/build