ControllerInterface: mixed comments

Source/Core/InputCommon/ControllerInterface/ControllerInterface.h

@@ -67,6 +67,9 @@ public:
   void Shutdown();
   void AddDevice(std::shared_ptr<ciface::Core::Device> device);
   void RemoveDevice(std::function<bool(const ciface::Core::Device*)> callback);
+  // This is mandatory to use on device populations functions that can be called concurrently by
+  // more than one thread, or that are called by a single other thread.
+  // Without this, our devices list might end up in a mixed state.
   void PlatformPopulateDevices(std::function<void()> callback);
   bool IsInit() const { return m_is_init; }
   void UpdateInput();