diff --git a/docs/programming-guide.md b/docs/programming-guide.md
index f4fabb0927b6..27816515c5de 100644
--- a/docs/programming-guide.md
+++ b/docs/programming-guide.md
@@ -1093,7 +1093,7 @@ for details.
 ### Shuffle operations
 
 Certain operations within Spark trigger an event known as the shuffle. The shuffle is Spark's
-mechanism for re-distributing data so that is grouped differently across partitions. This typically
+mechanism for re-distributing data so that it's grouped differently across partitions. This typically
 involves copying data across executors and machines, making the shuffle a complex and
 costly operation.