diff --git a/lua/treesj/langs/python.lua b/lua/treesj/langs/python.lua
index b2de4eb..1c46663 100644
--- a/lua/treesj/langs/python.lua
+++ b/lua/treesj/langs/python.lua
@@ -83,7 +83,9 @@ return {
     },
   }),
   argument_list = lang_utils.set_preset_for_args(),
-  parameters = lang_utils.set_preset_for_args(),
+  parameters = lang_utils.set_preset_for_args({
+    split = { last_separator = true },
+  }),
   parenthesized_expression = lang_utils.set_preset_for_args({}),
   list_comprehension = lang_utils.set_preset_for_args(),
   set_comprehension = lang_utils.set_preset_for_args(),
diff --git a/tests/sample/index.py b/tests/sample/index.py
index 7c9553a..18a7171 100644
--- a/tests/sample/index.py
+++ b/tests/sample/index.py
@@ -54,7 +54,7 @@ def adder(y):
 # RESULT OF SPLIT (node "parameters" and "function_definition", preset default)
 def create_adder(
     x,
-    b
+    b,
 ):
     def adder(y):
         return x + y