diff --git a/src/isomorphic/classic/class/ReactClass.js b/src/isomorphic/classic/class/ReactClass.js
index de9c9f5cfee5e..80134bf2b0a84 100644
--- a/src/isomorphic/classic/class/ReactClass.js
+++ b/src/isomorphic/classic/class/ReactClass.js
@@ -171,7 +171,6 @@ var ReactClassInterface: {[key: string]: SpecPolicy} = {
    *   }
    *
    * @return {ReactComponent}
-   * @nosideeffects
    * @required
    */
   render: 'DEFINE_ONCE',