diff --git a/idea/src/org/jetbrains/jet/lang/psi/JetThisExpression.java b/idea/src/org/jetbrains/jet/lang/psi/JetThisExpression.java
index 87214721ecb..630f5e01c98 100644
--- a/idea/src/org/jetbrains/jet/lang/psi/JetThisExpression.java
+++ b/idea/src/org/jetbrains/jet/lang/psi/JetThisExpression.java
@@ -19,6 +19,14 @@ public class JetThisExpression extends JetLabelQualifiedExpression {
         visitor.visitThisExpression(this);
     }
 
+    /**
+     * class A : B, C {
+     *     override fun foo() {
+     *         this<B>.foo()
+     *         this<C>.foo()
+     *     }
+     * }
+     */
     @Nullable
     public JetTypeReference getSuperTypeQualifier() {
         return (JetTypeReference) findChildByType(JetNodeTypes.TYPE_REFERENCE);