diff --git a/atom/browser/api/atom_api_app.cc b/atom/browser/api/atom_api_app.cc
index 2dfc3e056da..5ce918be78a 100644
--- a/atom/browser/api/atom_api_app.cc
+++ b/atom/browser/api/atom_api_app.cc
@@ -278,6 +278,10 @@ v8::Local<v8::Value> App::DefaultSession(v8::Isolate* isolate) {
 }
 
 bool App::MakeSingleInstance(ProcessSingleton::NotificationCallback callback) {
+#if defined(OS_MACOSX)
+  LOG(ERROR) << "MakeSingleInstance is not implemnted on OS X";
+  return false;
+#endif
   if (process_singleton_.get())
     return false;
 
diff --git a/docs/api/app.md b/docs/api/app.md
index 95aa80b6dc8..bd017456a78 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -290,7 +290,7 @@ URLs that fall under "Local Intranet" sites (i.e. are in the same domain as you)
 However, this detection often fails when corporate networks are badly configured,
 so this lets you co-opt this behavior and enable it for all URLs.
 
-### `app.makeSingleInstance(callback)`
+### `app.makeSingleInstance(callback)` _Windows_ _Linux_
 
 * `callback` Function