diff --git a/typeforce/_core.py b/typeforce/_core.py
index c562abf..947798e 100644
--- a/typeforce/_core.py
+++ b/typeforce/_core.py
@@ -88,7 +88,7 @@ def modules(self) -> typing.Iterable[Module]:
                 continue
             yield Module(path=mpath, exe=self.exe, dry=self.dry)
 
-    def run(self):
+    def run(self) -> typing.Iterable[str]:
         for module in self.modules:
             status = module.process()
             yield TEMPLATE.format(