Merge pull request facebook#2167 from mhintz/patch-1

Update ref-03-component-specs.md

docs/docs/ref-03-component-specs.md

@@ -118,7 +118,7 @@ Invoked once, both on the client and server, immediately before the initial rend
 componentDidMount()
 ```
 
-Invoked immediately after rendering occurs, only on the client (not on the server). At this point in the lifecycle, the component has a DOM representation which you can access via `this.getDOMNode()`.
+Invoked once, only on the client (not on the server), immediately after the initial rendering occurs. At this point in the lifecycle, the component has a DOM representation which you can access via `this.getDOMNode()`.
 
 If you want to integrate with other JavaScript frameworks, set timers using `setTimeout` or `setInterval`, or send AJAX requests, perform those operations in this method.