diff --git a/public/docs/ts/latest/guide/npm-packages.jade b/public/docs/ts/latest/guide/npm-packages.jade
index 38a4497fad..25773d4c77 100644
--- a/public/docs/ts/latest/guide/npm-packages.jade
+++ b/public/docs/ts/latest/guide/npm-packages.jade
@@ -163,7 +163,7 @@ a(id="polyfills")
 .l-main-section
 :marked
   ### Polyfill packages
-  ### 填充(Polyfile)包
+  ### 填充(Polyfill)包
   
   Angular requires certain [polyfills](https://en.wikipedia.org/wiki/Polyfill) in the application environment.
   Install these polyfills using the npm packages that Angular lists in the *peerDependencies* section of its `package.json`.