diff --git a/src/compose/__init__.py b/src/compose/__init__.py
index 867f7c0..74125c8 100644
--- a/src/compose/__init__.py
+++ b/src/compose/__init__.py
@@ -1,6 +1,3 @@
-# Copyright (c) 2023, the Compose project contributors.
-# SPDX-License-Identifier: GPL-3.0-or-later
-
 """Docker Compose YAML file generator.
 
 This package provides utilities for programmatically creating and managing Docker Compose
@@ -51,6 +48,9 @@ class VolumeConfig(BaseModel):
     labels: dict[str, str] | list[str] | None = None
     name: str | None = None
 
+    # Allow extra fields for flexibility and to support arbitrary Docker Compose extensions.
+    model_config = {"extra": "allow"}
+
 
 class NetworkConfig(BaseModel):
     """Represents a network configuration for a Docker Compose file."""