diff --git a/ome_zarr/format.py b/ome_zarr/format.py
index c0027ef3..8d4238b0 100644
--- a/ome_zarr/format.py
+++ b/ome_zarr/format.py
@@ -351,6 +351,10 @@ class FormatV05(FormatV04):
     def version(self) -> str:
         return "0.5"
 
+    @property
+    def version_key(self) -> str:
+        return "https://ngff.openmicroscopy.org/0.5"
+
     def init_store(self, path: str, mode: str = "r") -> FSStore:
         """
         Returns a Zarr v3 PathStore
diff --git a/ome_zarr/writer.py b/ome_zarr/writer.py
index 046c1acb..b39e3e03 100644
--- a/ome_zarr/writer.py
+++ b/ome_zarr/writer.py
@@ -365,7 +365,10 @@ def write_multiscales_metadata(
     if axes is not None:
         multiscales[0]["axes"] = axes
 
-    group.attrs["multiscales"] = multiscales
+    if hasattr(fmt, "version_key"):
+        group.attrs[fmt.version_key] = {"multiscales": multiscales}
+    else:
+        group.attrs["multiscales"] = multiscales
 
 
 def write_plate_metadata(