diff --git a/hpvm/lib/Transforms/ClearDFG/ClearDFG.cpp b/hpvm/lib/Transforms/ClearDFG/ClearDFG.cpp
index c23043e7829a8947a995f7ad97688091c46cf23d..b90b641a9d4a224279af064eafcc397985277168 100644
--- a/hpvm/lib/Transforms/ClearDFG/ClearDFG.cpp
+++ b/hpvm/lib/Transforms/ClearDFG/ClearDFG.cpp
@@ -6,6 +6,12 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This pass HPVM intrinsics from HPVM IR. This pass is the final pass that 
+// runs as a part of clean up after construction of dataflowgraph and LLVM
+// code generation for different targets from the dataflow graph.
+//
+//===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "ClearDFG"
 #include "BuildDFG/BuildDFG.h"