diff --git a/hpvm/lib/Transforms/DFG2LLVM_CUDNN/DFG2LLVM_CUDNN.cpp b/hpvm/lib/Transforms/DFG2LLVM_CUDNN/DFG2LLVM_CUDNN.cpp
index bd26a92fd343ce2057e5ab9c32c412681aef9da9..4653ad0f8a4c4ddd8d76e984b1750d9f94d813a9 100644
--- a/hpvm/lib/Transforms/DFG2LLVM_CUDNN/DFG2LLVM_CUDNN.cpp
+++ b/hpvm/lib/Transforms/DFG2LLVM_CUDNN/DFG2LLVM_CUDNN.cpp
@@ -1,4 +1,4 @@
-//=== DFG2LLVM_CUDNN.cpp ===//
+//===------------------------- DFG2LLVM_CUDNN.cpp ------------------------ ===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,6 +6,14 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This pass replaces the tensor operations in HPVM with appropriate API to 
+// the runtime, which leverages CuDNN library for implementing the supported
+// tensor operations.
+//
+//===----------------------------------------------------------------------===//
+
+
 #define ENABLE_ASSERTS
 
 #define DEBUG_TYPE "DFG2LLVM_CUDNN"
diff --git a/hpvm/lib/Transforms/DFG2LLVM_WrapperAPI/DFG2LLVM_WrapperAPI.cpp b/hpvm/lib/Transforms/DFG2LLVM_WrapperAPI/DFG2LLVM_WrapperAPI.cpp
index b400c12021d2df712ea0bbd04f03dbe8724abc75..3fa6860b9c7cb12b2f76c22196fa744cd052c2bb 100644
--- a/hpvm/lib/Transforms/DFG2LLVM_WrapperAPI/DFG2LLVM_WrapperAPI.cpp
+++ b/hpvm/lib/Transforms/DFG2LLVM_WrapperAPI/DFG2LLVM_WrapperAPI.cpp
@@ -1,4 +1,4 @@
-//=== DFG2LLVM_WrapperAPI.cpp ===//
+//===------------------------- DFG2LLVM_Wrapper.cpp --------------------- ===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,6 +6,15 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This pass is responsible for "fusing" multiple tensor operations in HPVM
+// nodes so that the appropriate set of operations are replaced with a single
+// call to a runtime routine. This allows the HPVM IR to represent a graph
+// with tensor operations in a target-agnostic manner.
+//
+//===----------------------------------------------------------------------===//
+
+
 #define ENABLE_ASSERTS
 
 #define DEBUG_TYPE "DFG2LLVM_WrapperAPI"
diff --git a/hpvm/lib/Transforms/FuseHPVMTensorNodes/FuseHPVMTensorNodes.cpp b/hpvm/lib/Transforms/FuseHPVMTensorNodes/FuseHPVMTensorNodes.cpp
index bb793dab6e0be854a9f102f968b493f146449e4e..6b51d731fe23943fd832de95616945499f75f670 100644
--- a/hpvm/lib/Transforms/FuseHPVMTensorNodes/FuseHPVMTensorNodes.cpp
+++ b/hpvm/lib/Transforms/FuseHPVMTensorNodes/FuseHPVMTensorNodes.cpp
@@ -1,4 +1,4 @@
-//===                        FuseHPVMTensorNodes.cpp                       ===//
+//===------------------------- FuseHPVMTensorNodes.cpp ------------------- ===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -6,6 +6,16 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+//
+// This pass is uses fuses HPVM nodes based on the tensor operations contained
+// the nodes. This helps create the groundwork for indicating to the compiler
+// that a set of tensor operations in a node are fusionable and it can have 
+// implications on performance and energy consumption of set of tensor
+// operations in question.
+//
+//===----------------------------------------------------------------------===//
+
+
 
 #define DEBUG_TYPE "FuseTensorNodes"