diff --git a/client/net/minecraftforge/client/model/IModelCustom.java b/client/net/minecraftforge/client/model/IModelCustom.java
index 35b4c01ea..dce97e39e 100644
--- a/client/net/minecraftforge/client/model/IModelCustom.java
+++ b/client/net/minecraftforge/client/model/IModelCustom.java
@@ -5,5 +5,7 @@ package net.minecraftforge.client.model;
 public interface IModelCustom {
     String getType();
     void renderAll();
+    void renderOnly(String... groupNames);
     void renderPart(String partName);
+    void renderAllExcept(String... excludedGroupNames);
 }