Update overview.md

docs/api/overview.md

@@ -18,7 +18,7 @@ const conf = await app.getConfig();  // Vanilla Js: await Neutralino.app.getConf
 ```
 
 Let's learn how native API calls internally work. Assume that you need to get an environment variable value from the operating system. 
-You can call the [`Neutralino.os.getEnv`](os.md#osgetenvkey)
+You can call the [`Neutralino.os.getEnv`](../api/os.md#osgetenvkey)
 JavaScript method. The client library will call the Neutralinojs server with a WebSocket message once you invoke
 the `getEnv` method. After that, the Neutralinojs server will execute the native operation to fetch the given
 environment variable.