diff --git a/ldm/invoke/merge_diffusers.py b/ldm/invoke/merge_diffusers.py
index 08720133c4..1c8a2c63bb 100644
--- a/ldm/invoke/merge_diffusers.py
+++ b/ldm/invoke/merge_diffusers.py
@@ -79,8 +79,8 @@ def merge_diffusion_models_and_commit(
     merged_model_name = name for new model
     alpha  - The interpolation parameter. Ranges from 0 to 1.  It affects the ratio in which the checkpoints are merged. A 0.8 alpha
                would mean that the first model checkpoints would affect the final result far less than an alpha of 0.2
-    interp - The interpolation method to use for the merging. Supports "sigmoid", "inv_sigmoid", "add_difference" and None.
-               Passing None uses the default interpolation which is weighted sum interpolation. For merging three checkpoints, only "add_difference" is supported.
+    interp - The interpolation method to use for the merging. Supports "weighted_average", "sigmoid", "inv_sigmoid", "add_difference" and None.
+               Passing None uses the default interpolation which is weighted sum interpolation. For merging three checkpoints, only "add_difference" is supported. Add_difference is A+(B-C).
     force  - Whether to ignore mismatch in model_config.json for the current models. Defaults to False.
 
     **kwargs - the default DiffusionPipeline.get_config_dict kwargs:
@@ -322,7 +322,7 @@ class mergeModelsForm(npyscreen.FormMultiPageAction):
         self.merged_model_name.value = merged_model_name
 
         if selected_model3 > 0:
-            self.merge_method.values = ['add_difference']
+            self.merge_method.values = ['add_difference ( A+(B-C) )']
             self.merged_model_name.value += f"+{models[selected_model3]}"
         else:
             self.merge_method.values = self.interpolations
@@ -348,11 +348,14 @@ class mergeModelsForm(npyscreen.FormMultiPageAction):
         ]
         if self.model3.value[0] > 0:
             models.append(model_names[self.model3.value[0] - 1])
+            interp='add_difference'
+        else:
+            interp=self.interpolations[self.merge_method.value[0]]
 
         args = dict(
             models=models,
             alpha=self.alpha.value,
-            interp=self.interpolations[self.merge_method.value[0]],
+            interp=interp,
             force=self.force.value,
             merged_model_name=self.merged_model_name.value,
         )
@@ -416,7 +419,8 @@ def run_gui(args: Namespace):
     mergeapp.run()
 
     args = mergeapp.merge_arguments
-    merge_diffusion_models_and_commit(**args)
+    print(f'DEBUG: {args}')
+    #merge_diffusion_models_and_commit(**args)
     print(f'>> Models merged into new model: "{args["merged_model_name"]}".')