Added more comments

service.py

@@ -80,6 +80,8 @@ def main() -> int:
                                    lambda x: bool(RE_TEXT.match(x)))
     """
     Ensures the necessary customer setup.
+    
+    NOTE: The customer and the `envs` directory inside of it never get removed.
     """
     envs_dir = path.join("customers", customer_name, "envs")
     Path(envs_dir).mkdir(parents=True, exist_ok=True)