diff --git a/routing/slash_in_parameter.rst b/routing/slash_in_parameter.rst
index afa24304ee1..56714c135fc 100644
--- a/routing/slash_in_parameter.rst
+++ b/routing/slash_in_parameter.rst
@@ -77,6 +77,15 @@ a more permissive regular expression for it:
That's it! Now, the ``{token}`` parameter can contain the ``/`` character.
+.. note::
+
+ If the route includes the special ``{_format}`` placeholder, you shouldn't
+ use the ``.+`` requirement for the parameters that allow slashes. For example,
+ if the pattern is ``/share/{token}.{_format}`` and ``{token}`` allows any
+ character, the ``/share/foo/bar.json`` URL will consider ``foo/bar.json``
+ as the token and the format will be empty. This can be solved replacing the
+ ``.+`` requirement by ``[^.]+`` to allow any character except dots.
+
.. note::
If the route defines several placeholders and you apply this permissive
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