diff --git a/haystack/components/routers/document_length_router.py b/haystack/components/routers/document_length_router.py
index af05a0c21..41281e73b 100644
--- a/haystack/components/routers/document_length_router.py
+++ b/haystack/components/routers/document_length_router.py
@@ -37,6 +37,7 @@ class DocumentLengthRouter:
     #     "short_documents": [Document(content="Short", ...)],
     #     "long_documents": [Document(content="Long document ...", ...)],
     # }
+    ```
     """
 
     def __init__(self, *, threshold: int = 10) -> None: