diff --git a/fimfarchive/fetchers/directory.py b/fimfarchive/fetchers/directory.py
index d6d143f..f21da27 100644
--- a/fimfarchive/fetchers/directory.py
+++ b/fimfarchive/fetchers/directory.py
@@ -25,7 +25,7 @@ Directory fetcher.
 import json
 from itertools import chain
 from pathlib import Path
-from typing import Any, Dict, Iterable, Iterator, Optional, Set, Union
+from typing import Any, Dict, Iterable, Iterator, Optional, Set, Sized, Union
 
 from fimfarchive.exceptions import InvalidStoryError, StorySourceError
 from fimfarchive.flavors import Flavor
@@ -40,7 +40,7 @@ __all__ = (
 )
 
 
-class DirectoryFetcher(Fetcher):
+class DirectoryFetcher(Iterable[Story], Sized, Fetcher):
     """
     Fetches stories from file system.
     """
diff --git a/fimfarchive/fetchers/fimfarchive.py b/fimfarchive/fetchers/fimfarchive.py
index dc926cd..5ff62bf 100644
--- a/fimfarchive/fetchers/fimfarchive.py
+++ b/fimfarchive/fetchers/fimfarchive.py
@@ -27,8 +27,8 @@ import marshal
 from io import BufferedReader
 from multiprocessing import Pool
 from typing import (
-    cast, Any, Callable, Dict, IO, Iterator,
-    Mapping, Optional, Tuple, Union,
+    cast, Any, Callable, Dict, IO, Iterable, Iterator,
+    Mapping, Optional, Sized, Tuple, Union,
 )
 from zipfile import ZipFile, BadZipFile
 
@@ -144,7 +144,7 @@ class MemoryIndex(Index):
         self.data.clear()
 
 
-class FimfarchiveFetcher(Fetcher):
+class FimfarchiveFetcher(Iterable[Story], Sized, Fetcher):
     """
     Fetcher for Fimfarchive.
     """