diff --git a/core/src/main/scala/spark/RDD.scala b/core/src/main/scala/spark/RDD.scala
index 96d5c0b80c22e2126570a33b053b55377951c15d..dd54c6a1238d1d5f8d34baa983038927fd68c8e0 100644
--- a/core/src/main/scala/spark/RDD.scala
+++ b/core/src/main/scala/spark/RDD.scala
@@ -365,7 +365,7 @@ abstract class RDD[T: ClassManifest](
     new MapPartitionsWithIndexRDD(this, sc.clean(f), preservesPartitioning)
 
   /**
-   * Maps f over this RDD where, f takes an additional parameter of type A.  This
+   * Maps f over this RDD, where f takes an additional parameter of type A.  This
    * additional parameter is produced by constructorOfA, which is called in each
    * partition with the index of that partition.
    */