diff --git a/.gitignore b/.gitignore
index 5dd5b36d4..4cc85a692 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,6 @@ doc/build/
 
 # Release Notes documentation
 releasenotes/build
+
+# Api Ref documentation
+api-ref/build/