diff --git a/comfy_extras/nodes_model_merging.py b/comfy_extras/nodes_model_merging.py
index bce4b3dd..ebcbd4be 100644
--- a/comfy_extras/nodes_model_merging.py
+++ b/comfy_extras/nodes_model_merging.py
@@ -27,6 +27,44 @@ class ModelMergeSimple:
             m.add_patches({k: kp[k]}, 1.0 - ratio, ratio)
         return (m, )
 
+class ModelSubtract:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": { "model1": ("MODEL",),
+                              "model2": ("MODEL",),
+                              "multiplier": ("FLOAT", {"default": 1.0, "min": -10.0, "max": 10.0, "step": 0.01}),
+                              }}
+    RETURN_TYPES = ("MODEL",)
+    FUNCTION = "merge"
+
+    CATEGORY = "_for_testing/model_merging"
+
+    def merge(self, model1, model2, multiplier):
+        m = model1.clone()
+        kp = model2.get_key_patches("diffusion_model.")
+        for k in kp:
+            m.add_patches({k: kp[k]}, - multiplier, multiplier)
+        return (m, )
+
+class ModelAdd:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": { "model1": ("MODEL",),
+                              "model2": ("MODEL",),
+                              }}
+    RETURN_TYPES = ("MODEL",)
+    FUNCTION = "merge"
+
+    CATEGORY = "_for_testing/model_merging"
+
+    def merge(self, model1, model2):
+        m = model1.clone()
+        kp = model2.get_key_patches("diffusion_model.")
+        for k in kp:
+            m.add_patches({k: kp[k]}, 1.0, 1.0)
+        return (m, )
+
+
 class CLIPMergeSimple:
     @classmethod
     def INPUT_TYPES(s):
@@ -144,6 +182,8 @@ class CheckpointSave:
 NODE_CLASS_MAPPINGS = {
     "ModelMergeSimple": ModelMergeSimple,
     "ModelMergeBlocks": ModelMergeBlocks,
+    "ModelMergeSubtract": ModelSubtract,
+    "ModelMergeAdd": ModelAdd,
     "CheckpointSave": CheckpointSave,
     "CLIPMergeSimple": CLIPMergeSimple,
 }