diff --git a/codemod/populate_custom_docs.py b/codemod/populate_custom_docs.py
index 1a92a4ee..c7be5495 100644
--- a/codemod/populate_custom_docs.py
+++ b/codemod/populate_custom_docs.py
@@ -104,12 +104,16 @@ def _customize_docs_for_resource(self, content: str, resource_name: str) -> str:
         sync_generate_call = create_sync_params.replace(
             f"client.v1.{resource_name}.create(", f"client.v1.{resource_name}.generate("
         )
-        sync_generate_call = sync_generate_call + f"\n    {generate_params}\n)"
+        sync_generate_call = self._append_generate_parameters(
+            sync_generate_call, generate_params
+        )
 
         async_generate_call = create_async_params.replace(
             f"client.v1.{resource_name}.create(", f"client.v1.{resource_name}.generate("
         )
-        async_generate_call = async_generate_call + f"\n    {generate_params}\n)"
+        async_generate_call = self._append_generate_parameters(
+            async_generate_call, generate_params
+        )
 
         # Replace api-assets/id and image/id paths with /path/to paths in the code samples
         # Preserve the file ID and extension: api-assets/id/1234.mp4 -> /path/to/1234.mp4
@@ -172,6 +176,13 @@ def replacement(m: re.Match[str]) -> str:
         # Return the customized content - replacement will be handled by the caller
         return custom_docs_content
 
+    @staticmethod
+    def _append_generate_parameters(create_call: str, generate_params: str) -> str:
+        """Append generate-only parameters after a valid comma-separated create call."""
+        create_call = create_call.rstrip()
+        separator = "" if create_call.endswith(",") else ","
+        return f"{create_call}{separator}\n    {generate_params}\n)"
+
     def _fallback_customization(self, content: str, resource_name: str) -> str:
         """Fallback customization when create samples aren't found."""
         # This is the original approach as a fallback
diff --git a/magic_hour/resources/v1/face_detection/README.md b/magic_hour/resources/v1/face_detection/README.md
index 35c00e6c..abdfd661 100644
--- a/magic_hour/resources/v1/face_detection/README.md
+++ b/magic_hour/resources/v1/face_detection/README.md
@@ -32,7 +32,7 @@ from os import getenv
 
 client = Client(token=getenv("API_TOKEN"))
 res = client.v1.face_detection.generate(
-    assets={"target_file_path": "/path/to/1234.png"}, confidence_score=0.5
+    assets={"target_file_path": "/path/to/1234.png"}, confidence_score=0.5,
     wait_for_completion=True,
     download_outputs=True,
     download_directory="."
@@ -47,7 +47,7 @@ from os import getenv
 
 client = AsyncClient(token=getenv("API_TOKEN"))
 res = await client.v1.face_detection.generate(
-    assets={"target_file_path": "/path/to/1234.png"}, confidence_score=0.5
+    assets={"target_file_path": "/path/to/1234.png"}, confidence_score=0.5,
     wait_for_completion=True,
     download_outputs=True,
     download_directory="."