diff --git a/relay/include/relay/environment.h b/relay/include/relay/environment.h
index 1bba18839d6cb..658d176f732a2 100644
--- a/relay/include/relay/environment.h
+++ b/relay/include/relay/environment.h
@@ -1,5 +1,5 @@
 /*!
- *  Copyright (c) 2017 by Contributors
+ *  Copyright (c) 2018 by Contributors
  * \file environment.h
  * \brief The global environment containing
  */
diff --git a/relay/include/relay/node.h b/relay/include/relay/node.h
index 388699e2f1610..d1f12ca68ecb5 100644
--- a/relay/include/relay/node.h
+++ b/relay/include/relay/node.h
@@ -421,7 +421,7 @@ TVM_DEFINE_NODE_REF(LocalId, LocalIdNode);
 
 class GlobalId;
 
-/*! \brief A LocalId from the node's current type to target type. */
+/*! \brief A GlobalId from the node's current type to target type. */
 class GlobalIdNode : public ExprNode {
  public:
   std::string name;
@@ -440,7 +440,7 @@ TVM_DEFINE_NODE_REF(GlobalId, GlobalIdNode);
 
 class IntrinsicId;
 
-/*! \brief A LocalId from the node's current type to target type. */
+/*! \brief A IntrinsicId from the node's current type to target type. */
 class IntrinsicIdNode : public ExprNode {
  public:
   std::string name;
@@ -459,7 +459,7 @@ TVM_DEFINE_NODE_REF(IntrinsicId, IntrinsicIdNode)
 
 class Param;
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief A parameter. */
 class ParamNode : public ExprNode {
  public:
   LocalId id;
@@ -482,7 +482,7 @@ TVM_DEFINE_NODE_REF(Param, ParamNode)
 
 class Function;
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief A function. */
 class FunctionNode : public ExprNode {
  public:
   tvm::Array<Param> params;
@@ -505,7 +505,7 @@ TVM_DEFINE_NODE_REF(Function, FunctionNode)
 
 class Call;
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief A call. */
 class CallNode : public ExprNode {
  public:
   Expr fn;
@@ -528,7 +528,7 @@ TVM_DEFINE_NODE_REF(Call, CallNode)
 
 class Debug;
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief Debug. */
 class DebugNode : public ExprNode {
  public:
   Expr node;
@@ -551,7 +551,7 @@ enum UOp : int {
   NEG = 0,
 };
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief Unary Operator. */
 class UnaryOpNode : public ExprNode {
  public:
   UOp op;
@@ -587,7 +587,7 @@ enum BinOp : int {
   GE = 9
 };
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief A Binary Operator. */
 class BinaryOpNode : public ExprNode {
  public:
   BinOp op;
@@ -614,7 +614,7 @@ class Assignment;
 
 // TODO(jroesch) : make me contain the proper fields.
 
-/*! \brief A cast from the node's current type to target type. */
+/*! \brief Assignment. */
 class AssignmentNode : public ExprNode {
  public:
   tvm::Map<LocalId, Expr> assignments;
@@ -718,7 +718,6 @@ class ProjectionNode : public ExprNode {
 
 TVM_DEFINE_NODE_REF(Projection, ProjectionNode);
 
-/*! \brief Base type of the Relay item hiearchy. */
 struct ItemNode : Node {
  public:
   GlobalId id;
@@ -741,7 +740,6 @@ struct Item : public NodeRef {
 
 class Primitive;
 
-/*! \brief A cast from the node's current type to target type. */
 class PrimitiveNode : public ItemNode {
  public:
   Type type;
@@ -763,7 +761,6 @@ TVM_DEFINE_NODE_REF(Primitive, PrimitiveNode);
 
 class Defn;
 
-/*! \brief A cast from the node's current type to target type. */
 class DefnNode : public ItemNode {
  public:
   Type type;
diff --git a/relay/src/relay/environment.cc b/relay/src/relay/environment.cc
index ce025c98de677..cd385147ab5a5 100644
--- a/relay/src/relay/environment.cc
+++ b/relay/src/relay/environment.cc
@@ -1,6 +1,6 @@
 /*!
  *  Copyright (c) 2018 by Contributors
- * \file node.cc
+ * \file  environment.cc
  * \brief Relay node data structure.
  */
 #include <nnvm/relay/environment.h>