diff --git a/jwt/api_jwt.py b/jwt/api_jwt.py
index e1b8a7a7..ca4f8b78 100644
--- a/jwt/api_jwt.py
+++ b/jwt/api_jwt.py
@@ -150,7 +150,7 @@ def decode(
         detached_payload: Optional[bytes] = None,
         # passthrough arguments to _validate_claims
         # consider putting in options
-        audience: Optional[Union[str, Iterable]] = None,
+        audience: Optional[Union[str, Iterable[str]]] = None,
         issuer: Optional[str] = None,
         leeway: Union[int, float, timedelta] = 0,
         # kwargs