diff --git a/game/addons/mat_maker_gd/nodes/mm_node.gd b/game/addons/mat_maker_gd/nodes/mm_node.gd
index 4fb44853..83fbdc0d 100644
--- a/game/addons/mat_maker_gd/nodes/mm_node.gd
+++ b/game/addons/mat_maker_gd/nodes/mm_node.gd
@@ -2,6 +2,15 @@ tool
 class_name MMNode
 extends Resource
 
+enum SlotTypes {
+	SLOT_TYPE_NONE = -1,
+	SLOT_TYPE_IMAGE = 0,
+	SLOT_TYPE_INT = 1,
+	SLOT_TYPE_FLOAT = 2,
+	SLOT_TYPE_VECTOR2 = 3,
+	SLOT_TYPE_VECTOR3 = 4,
+}
+
 export(Vector2) var graph_position : Vector2 = Vector2()
 
 func recalculate_image(material, slot_idx : int) -> ImageTexture: