diff --git a/src/zarr/api/asynchronous.py b/src/zarr/api/asynchronous.py
index 409601e474..dcfadf6a3f 100644
--- a/src/zarr/api/asynchronous.py
+++ b/src/zarr/api/asynchronous.py
@@ -250,14 +250,23 @@ async def consolidate_metadata(
 
 
 async def copy(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     raise NotImplementedError
 
 
 async def copy_all(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     raise NotImplementedError
 
 
 async def copy_store(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     raise NotImplementedError
 
 
diff --git a/src/zarr/api/synchronous.py b/src/zarr/api/synchronous.py
index 1146a6876f..1e47208dcc 100644
--- a/src/zarr/api/synchronous.py
+++ b/src/zarr/api/synchronous.py
@@ -112,14 +112,23 @@ def consolidate_metadata(
 
 
 def copy(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     return sync(async_api.copy(*args, **kwargs))
 
 
 def copy_all(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     return sync(async_api.copy_all(*args, **kwargs))
 
 
 def copy_store(*args: Any, **kwargs: Any) -> tuple[int, int, int]:
+    """
+    Not implemented.
+    """
     return sync(async_api.copy_store(*args, **kwargs))