OSX: more descriptive comment

intern/ghost/intern/GHOST_SystemCocoa.mm

@@ -1025,7 +1025,7 @@ GHOST_TSuccess GHOST_SystemCocoa::handleWindowEvent(GHOST_TEventType eventType,
 	}
 		switch (eventType) {
 			case GHOST_kEventWindowClose:
-				// make sure index 1 exists and compare window adress
+				// check for index 1 and discard close for mainwindow as it would quit blender without dialog
 				if ([windowsList count] > 1 && (window->get_m_window() != [windowsList objectAtIndex:1])) {
 					pushEvent( new GHOST_Event(getMilliSeconds(), GHOST_kEventWindowClose, window) );
 				}