diff --git a/docs/streaming.md b/docs/streaming.md
index 6060e9eb..abfd7e59 100644
--- a/docs/streaming.md
+++ b/docs/streaming.md
@@ -61,7 +61,7 @@ Return an error `_jc_meta` field.
 ### add\_jc\_meta
 
 ```python
-def add_jc_meta(func)
+def add_jc_meta(func: F) -> F
 ```
 
 Decorator for streaming parsers to add stream_success and stream_error