diff --git a/public/docs/ts/latest/guide/upgrade.jade b/public/docs/ts/latest/guide/upgrade.jade
index fc7a63157d..3a3fa0346f 100644
--- a/public/docs/ts/latest/guide/upgrade.jade
+++ b/public/docs/ts/latest/guide/upgrade.jade
@@ -205,7 +205,7 @@ include ../_util-fns
 :marked
   # Upgrading with The Upgrade Adapter
   
-  The `upgrade` module in Angular 2 is a very userful tool for upgrading
+  The `upgrade` module in Angular 2 is a very useful tool for upgrading
   anything but the smallest of applications. With it we can mix and match
   Angular 1 and 2 components in the same application and have them interoperate
   seamlessly. That means we don't have to do the upgrade work all at once,