diff --git a/docs/10.1-animation.md b/docs/10.1-animation.md
index 5794e62dc..d18b13266 100644
--- a/docs/10.1-animation.md
+++ b/docs/10.1-animation.md
@@ -141,7 +141,7 @@ You can disable animating `enter` or `leave` animations if you want. For example
 
 ## Low-level API: `ReactTransitionGroup`
 
-`ReactTransitionGroup` is the basis for animations. When children are declaratively added or removed from it (as in the example above) special lifecycle hooks are called on them.
+`ReactTransitionGroup` is the basis for animations. It is accessible as `React.addons.TransitionGroup`. When children are declaratively added or removed from it (as in the example above) special lifecycle hooks are called on them.
 
 ### `componentWillEnter(callback)`