diff --git a/module_build_service/common/resolve.py b/module_build_service/common/resolve.py
index 4c8ea186..ef08375c 100644
--- a/module_build_service/common/resolve.py
+++ b/module_build_service/common/resolve.py
@@ -134,9 +134,10 @@ def get_base_module_mmds(db_session, mmd):
     old versions of the base module based on the stream version.
 
     :param Modulemd mmd: Input modulemd metadata.
-    :rtype: dict with lists of Modulemd
-    :return: Dict with "ready", "garbage", and "missing" state name as a key and list of MMDs of
-        base modules buildrequired by `mmd` as a value.
+    :rtype: dict with lists of Modulemd and missing stream strings.
+    :return: Dict with "ready" or "garbage" state name as a key and list of MMDs of
+        base modules buildrequired by `mmd` as a value.  Also includes "missing" as
+        a key and a list of base module streams that were not found.
     """
     from module_build_service.common import models