diff --git a/unix/x0vncserver/PollingManager.cxx b/unix/x0vncserver/PollingManager.cxx
index 841ce0f..da0f21b 100644
--- a/unix/x0vncserver/PollingManager.cxx
+++ b/unix/x0vncserver/PollingManager.cxx
@@ -50,6 +50,8 @@
 // Note that dpy and image should remain valid during the object
 // lifetime, while factory is used only in the constructor itself.
 //
+// FIXME: Pass XPixelBuffer* instead of Image*.
+//
 
 PollingManager::PollingManager(Display *dpy, Image *image,
                                ImageFactory *factory,