diff --git a/hpvm/lib/Transforms/LocalMem/LocalMem.cpp b/hpvm/lib/Transforms/LocalMem/LocalMem.cpp
index fc33ebee71123d89c5f931901dd213c82a401941..5cc134874c5c21da36fe290b30b49a26cc9e271f 100644
--- a/hpvm/lib/Transforms/LocalMem/LocalMem.cpp
+++ b/hpvm/lib/Transforms/LocalMem/LocalMem.cpp
@@ -6,6 +6,12 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This pass traverses the dataflow graph to recognize the allocation nodes which
+// allocate scratch memory. This pass does not make changes to the textual 
+// representation of HPVM IR.
+//
+//===----------------------------------------------------------------------===//
 
 #define DEBUG_TYPE "LocalMem"
 #include "SupportHPVM/DFG2LLVM.h"