diff --git a/doc/design/scope.md b/doc/design/scope.md
index 149e1ea1b986735988a2075e0cb5a2a9ad16f19d..2ff416f06e8ada48b1d4922f8869a106f35799e2 100644
--- a/doc/design/scope.md
+++ b/doc/design/scope.md
@@ -63,7 +63,7 @@ class Scope {
     if (var != nullptr) {
       return var;
     } else if (parent_ != nullptr) {
-      return parent_->Get(name);
+      return parent_->GetVariable(name);
     } else {
       return nullptr;
     }
@@ -102,7 +102,7 @@ class Scope {
 
  private:
   std::shared_ptr<Scope> parent_;
-  std::unordered_map<std::string, std::unique_ptr<Attribute>> vars_;
+  std::unordered_map<std::string, std::unique_ptr<Variable>> vars_;
 };
 ```
 ## Only scope can create a variable