diff --git a/tilecloud_chain/generate.py b/tilecloud_chain/generate.py
index f87656c61..649026d86 100644
--- a/tilecloud_chain/generate.py
+++ b/tilecloud_chain/generate.py
@@ -543,6 +543,12 @@ def __call__(self, config_file: str, layer_name: str) -> TileStore | None:
                 )
         return None
 
+    def __str__(self) -> str:
+        return self.__class__.__name__
+
+    def __repr__(self) -> str:
+        return self.__str__()
+
 
 def detach() -> None:
     """Detach to the parent process."""
diff --git a/tilecloud_chain/multitilestore.py b/tilecloud_chain/multitilestore.py
index 1f6cc1fb1..cef73bc61 100644
--- a/tilecloud_chain/multitilestore.py
+++ b/tilecloud_chain/multitilestore.py
@@ -116,13 +116,15 @@ def apply(key: tuple[str, str], tiles: Iterator[Tile]) -> Iterator[Tile]:
 
     def __str__(self) -> str:
         """Return a string representation of the object."""
-        stores = {str(store) for store in self.stores.values() if store is not None}
-        return f"{self.__class__.__name__}({', '.join(stores)})"
+        stores = {str(store) for store in self.stores.values()}
+        keys = {f"{config_file}/{layer}" for config_file, layer in self.stores}
+        return f"{self.__class__.__name__}({', '.join(stores)} - {', '.join(keys)})"
 
     def __repr__(self) -> str:
         """Return a string representation of the object."""
-        stores = {repr(store) for store in self.stores.values() if store is not None}
-        return f"{self.__class__.__name__}({', '.join(stores)})"
+        stores = {repr(store) for store in self.stores.values()}
+        keys = {f"{config_file}/{layer}" for config_file, layer in self.stores}
+        return f"{self.__class__.__name__}({', '.join(stores)} - {', '.join(keys)})"
 
     @staticmethod
     def _get_layer(tile: Tile | None) -> tuple[str, str]:
diff --git a/tilecloud_chain/timedtilestore.py b/tilecloud_chain/timedtilestore.py
index 699c93578..47ccba2c4 100644
--- a/tilecloud_chain/timedtilestore.py
+++ b/tilecloud_chain/timedtilestore.py
@@ -121,8 +121,8 @@ def get_cheap_bounding_pyramid(self) -> BoundingPyramid | None:
 
     def __str__(self) -> str:
         """Get string representation."""
-        return f"{self.__class__.__name__}({self._tile_store}"
+        return f"{self.__class__.__name__}({self._store_name}: {self._tile_store}"
 
     def __repr__(self) -> str:
         """Get string representation."""
-        return f"{self.__class__.__name__}({self._tile_store!r})"
+        return f"{self.__class__.__name__}({self._store_name}: {self._tile_store!r})"