diff --git a/test/TableGen/DagIntSubst.td b/test/TableGen/Dag.td
similarity index 63%
rename from test/TableGen/DagIntSubst.td
rename to test/TableGen/Dag.td
index 676f0b0270d..8b406a59d34 100644
--- a/test/TableGen/DagIntSubst.td
+++ b/test/TableGen/Dag.td
@@ -1,5 +1,8 @@
 // RUN: tblgen %s | FileCheck %s
 // XFAIL: vg_leak
+
+//===----------------------------------------------------------------------===//
+// Substitution of an int.
 def X1;
 
 class C1<int N> {
@@ -12,6 +15,8 @@ def VAL1 : C1<13>;
 // CHECK-NEXT: dag d = (X1 13)
 
 
+//===----------------------------------------------------------------------===//
+// Substitution of a DAG.
 def X2;
 
 class yclass;