diff --git a/querydsl-sql/src/main/java/com/mysema/query/sql/SQLCommonQuery.java b/querydsl-sql/src/main/java/com/mysema/query/sql/SQLCommonQuery.java
index 9497be964..80a655b56 100644
--- a/querydsl-sql/src/main/java/com/mysema/query/sql/SQLCommonQuery.java
+++ b/querydsl-sql/src/main/java/com/mysema/query/sql/SQLCommonQuery.java
@@ -14,7 +14,7 @@ import com.mysema.query.types.SubQueryExpression;
  * 
  * @author tiwe
  *
- * @param <Q>
+ * @param <Q> concrete type
  */
 public interface SQLCommonQuery<Q extends SQLCommonQuery<Q>> extends Query<Q> {
     
diff --git a/querydsl-sql/src/main/java/com/mysema/query/sql/Union.java b/querydsl-sql/src/main/java/com/mysema/query/sql/Union.java
index 7e5d7e426..c28c75e0f 100644
--- a/querydsl-sql/src/main/java/com/mysema/query/sql/Union.java
+++ b/querydsl-sql/src/main/java/com/mysema/query/sql/Union.java
@@ -15,7 +15,7 @@ import com.mysema.query.types.OrderSpecifier;
  *
  * @author tiwe
  *
- * @param <RT>
+ * @param <RT> return type of projection
  */
 public interface Union<RT>{