Adding reference

src/de/steamwar/bungeecore/Persistent.java

@@ -36,6 +36,7 @@ public class Persistent extends Plugin implements Listener {
 
     @EventHandler
     public void onGReload(ProxyReloadEvent e){
+        // Copied from https://www.spigotmc.org/resources/bungeepluginmanager-manage-your-bungee-plugin-at-runtime.63861/
         PluginManager pluginManager = getProxy().getPluginManager();
         Plugin bungeecore = pluginManager.getPlugin("BungeeCore");
         ClassLoader pluginClassLoader = bungeecore.getClass().getClassLoader();