diff --git a/doc/design/scope.md b/doc/design/scope.md
index b8390a371407d5f716f47f6b9d6160290c958d40..a0b0be50dc7075a89ef14470d93eaaaad387db18 100644
--- a/doc/design/scope.md
+++ b/doc/design/scope.md
@@ -9,16 +9,16 @@ class Variable;
 using VariablePtr = std::shared_ptr<Variable>;
 
 class Scope final {
-public:
+ public:
   Scope();
   Scope(const std::shared_ptr<Scope>& parent);
 
   //! Get Variable in this scope.
   //! @return nullptr if no such variable.
-  const VariablePtr& getVar(const std::string& name) const;
+  const VariablePtr& GetVar(const std::string& name) const;
 
   //! Create or get a variable in this scope.
-  VariablePtr& createOrGetVar(const std::string& name);
+  VariablePtr& GetOrCreateVar(const std::string& name);
 
 private:
   /// variable name -> variable
@@ -31,22 +31,22 @@ You need to specify a scope to run a Net. One net can run in different scopes an
 
 ```cpp
 Scope global;
-auto x = newVar("X");  // x is created in scope global, implicitly.
-auto y = newVar("Y");
+auto x = NewVar("X");  // x is created in scope global, implicitly.
+auto y = NewVar("Y");
 Net net1;
-net1.addOp("add", {x, y}, {x});  // x = x + y;
-net1.run();
+net1.AddOp("add", {x, y}, {x});  // x = x + y;
+net1.Run();
 
 for (size_t i=0; i<10; ++i) {
   Scope local;
-  auto tmp = newVar("tmp");  // tmp is created in scope local.
+  auto tmp = NewVar("tmp");  // tmp is created in scope local.
   Net net2;
-  net2.addOp("add", {x, y}, {tmp});
-  net2.run();  // tmp = x + y;
+  net2.AddOp("add", {x, y}, {tmp});
+  net2.Run();  // tmp = x + y;
 }
 
 Net net3;
-net3.addOp("add", {x, y}, {"tmp"});  // error! cannot found "tmp" in global scope.
+net3.AddOp("add", {x, y}, {"tmp"});  // error! cannot found "tmp" in global scope.
 
 ```