From 7c360432d20d0d7372b39025dee595d2c47a9ee5 Mon Sep 17 00:00:00 2001
From: authentictech <authentictech@users.noreply.github.com>
Date: Sat, 31 Jul 2021 23:00:32 +0100
Subject: [PATCH] Update routing.rst

Just adding the ? character to the route parameter without also adding ? to the function parameter type results in a TypeError: "Argument 1 passed to App\Controller\BlogController::list() must be of the type integer, null given"
---
 routing.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/routing.rst b/routing.rst
index ec39d1f8e00..dd6478ac539 100644
--- a/routing.rst
+++ b/routing.rst
@@ -815,7 +815,8 @@ parameter:
 .. tip::
 
     To give a ``null`` default value to any parameter, add nothing after the
-    ``?`` character (e.g. ``/blog/{page?}``).
+    ``?`` character (e.g. ``/blog/{page?}``). Also, remember to add the
+    ``?`` character before the function parameter type to make it permit null values (e.g. ``?int``) 
 
 Parameter Conversion
 ~~~~~~~~~~~~~~~~~~~~