diff --git a/hpvm/include/SupportHPVM/DFG2LLVM.h b/hpvm/include/SupportHPVM/DFG2LLVM.h
index 07147c6d909f5352dd886b5f8bc1a2b0ae434ffe..47bd242520c7d2ddca0e0bc7bbbab38fa9fdc543 100644
--- a/hpvm/include/SupportHPVM/DFG2LLVM.h
+++ b/hpvm/include/SupportHPVM/DFG2LLVM.h
@@ -9,6 +9,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This defines different classes for traversing Dataflow Graph for code 
+// generation for different nodes for different targets.
+//
+//===----------------------------------------------------------------------===//
 
 #include "BuildDFG/BuildDFG.h"
 #include "SupportHPVM/HPVMHint.h"