diff --git a/doc/setup.md b/doc/setup.md
index 36e6fc956..3135bf1d3 100644
--- a/doc/setup.md
+++ b/doc/setup.md
@@ -55,8 +55,19 @@ To use **N-API** in a native module:
 ```gyp
   'defines': [ 'NAPI_DISABLE_CPP_EXCEPTIONS' ],
 ```
-
-  4. Include `napi.h` in the native module code.
+  4. If you would like your native addon to support OSX, please also add the
+  following settings in the `binding.gyp` file:
+
+  ```gyp
+  ['OS=="mac"', {
+      'cflags+': ['-fvisibility=hidden'],
+      'xcode_settings': {
+        'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES', # -fvisibility=hidden
+      }
+  }]
+  ```
+
+  5. Include `napi.h` in the native module code.
      To ensure only ABI-stable APIs are used, DO NOT include
      `node.h`, `nan.h`, or `v8.h`.