diff --git a/README.md b/README.md
index 5030ce8c..74e4cafb 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ This library provides TypeScript type definitions and extracted parameters from
 TypeScript AST is used to generate the code, which is accurately converted to TypeScript code.
 Since the parameters extracted from OpenAPI can be used freely, it can be used for automatic generation of API Client and Server Side code, load balancer configuration files, etc.
 
-## Usage
+## Playground
 
 - [Playground](https://himenon.github.io/openapi-typescript-code-generator-playground/index.html)
 
diff --git a/docs/ja/README-ja.md b/docs/ja/README-ja.md
index 716f88b4..0e4a3f8d 100644
--- a/docs/ja/README-ja.md
+++ b/docs/ja/README-ja.md
@@ -10,7 +10,7 @@ OpenAPI から抽出したパラメーターは自由に使うことができる
 
 ## DEMO
 
-- [DEMO](./example/README.md)
+- [DEMO](../example/README.md)
 - [DEMO: github/rest-api-client code generate](https://github.com/Himenon/github-rest-api-client/tree/master/source)
   - https://github.com/github/rest-api-description