diff --git a/common/buildcraft/core/ICustomHighlight.java b/common/buildcraft/core/ICustomHighlight.java
new file mode 100644
index 00000000..453dc521
--- /dev/null
+++ b/common/buildcraft/core/ICustomHighlight.java
@@ -0,0 +1,12 @@
+package buildcraft.core;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.util.AxisAlignedBB;
+import net.minecraft.world.World;
+
+public interface ICustomHighlight{
+
+	public AxisAlignedBB[] getBoxes(World wrd, int x, int y, int z, EntityPlayer player);
+
+	public double getExpansion();
+}