diff --git a/.gitignore b/.gitignore
index 45ec09930a1a..4e6a62ceb3aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,8 +13,11 @@ Thumbs.db
 /Apps/Sandcastle/gallery/gallery-index.js
 /Apps/Sandcastle/templates/bucket.css
 
-/Source/
-!/Source/copyrightHeader.js
+/Source/Assets/
+/Source/ThirdParty/
+/Source/Widgets/
+/Source/Cesium.d.ts
+/Source/Cesium.js
 
 /Specs/SpecList.js
 /Specs/jasmine/**