diff --git a/querydsl-core/src/main/java/com/querydsl/core/group/GroupBy.java b/querydsl-core/src/main/java/com/querydsl/core/group/GroupBy.java
index c0693f09c..fe2e8218d 100644
--- a/querydsl-core/src/main/java/com/querydsl/core/group/GroupBy.java
+++ b/querydsl-core/src/main/java/com/querydsl/core/group/GroupBy.java
@@ -103,7 +103,7 @@ public final class GroupBy {
     }
 
     /**
-     * Create a new aggregating set expression using a backing LinkedHashMap
+     * Create a new aggregating set expression using a backing LinkedHashSet
      *
      * @param expression
      * @return