diff --git a/rossum_api/elis_api_client.py b/rossum_api/elis_api_client.py
index 6d25375..21f4ab5 100644
--- a/rossum_api/elis_api_client.py
+++ b/rossum_api/elis_api_client.py
@@ -157,7 +157,7 @@ async def list_all_organizations(
         self,
         ordering: Sequence[str] = (),
         **filters: Any,
-    ):
+    ) -> AsyncIterable[Organization]:
         """https://elis.rossum.ai/api/docs/#list-all-organizations."""
         async for o in self._http_client.fetch_all(Resource.Organization, ordering, **filters):
             yield self._deserializer(Resource.Organization, o)
diff --git a/rossum_api/elis_api_client_sync.py b/rossum_api/elis_api_client_sync.py
index 23ce40a..ed60619 100644
--- a/rossum_api/elis_api_client_sync.py
+++ b/rossum_api/elis_api_client_sync.py
@@ -165,7 +165,7 @@ def list_all_organizations(
         self,
         ordering: Sequence[str] = (),
         **filters: Dict[str, Any],
-    ):
+    ) -> Iterable[Organization]:
         """https://elis.rossum.ai/api/docs/#list-all-organizations."""
         return self._iter_over_async(
             self.elis_api_client.list_all_organizations(ordering, **filters)
diff --git a/rossum_api/models/py.typed b/rossum_api/models/py.typed
new file mode 100644
index 0000000..e69de29