diff --git a/docs/quick-start/config.md b/docs/quick-start/config.md
index f302af4b..e3b90545 100644
--- a/docs/quick-start/config.md
+++ b/docs/quick-start/config.md
@@ -4,8 +4,19 @@ label: 'Advanced config'
 order: -2
 ---
 
+## Disable os-related features
+
+If you want to disable os-related features, you can do this before including `pocketpy.h`.
+
+```cpp
+#define PK_ENABLE_OS 0
+#include <pocketpy.h>
+```
+
+## Full config
+
 You can create a `user_config.h` in the same directory as `pocketpy.h` to override some default settings.
 
-1. Copy [src/config.h](https://github.com/blueloveTH/pocketpy/blob/main/src/config.h) and rename it to `user_config.h`.
+1. Copy [src/config.h](https://github.com/blueloveTH/pocketpy/blob/main/include/pocketpy/config.h) and rename it to `user_config.h`.
 2. Define a macro `PK_USER_CONFIG_H` in `user_config.h`. This invalidates the default `config.h` and enables your `user_config.h`.
 3. Edit `user_config.h` to override default settings.
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