diff --git a/ExtJs.gitignore b/ExtJs.gitignore
index c92aea0f..ab97a8cc 100644
--- a/ExtJs.gitignore
+++ b/ExtJs.gitignore
@@ -10,3 +10,5 @@ ext/
 modern.json
 modern.jsonp
 resources/sass/.sass-cache/
+resources/.arch-internal-preview.css
+.arch-internal-preview.css