From d4ad47af624ef8382182fa3627b5e10e8ee2c703 Mon Sep 17 00:00:00 2001
From: Phil Schaf <flying-sheep@web.de>
Date: Sat, 11 Apr 2015 17:44:18 +0200
Subject: [PATCH] added info about an exception being raised for the old and
 broken behavior

---
 docs/upgrading.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/upgrading.rst b/docs/upgrading.rst
index d504da44..82a52206 100644
--- a/docs/upgrading.rst
+++ b/docs/upgrading.rst
@@ -43,6 +43,8 @@ See :ref:`error-handlers` for specifics.
     only for exception *instances*. This was unintended and plain wrong,
     and therefore was replaced with the intended behavior of registering
     handlers only using exception classes and HTTP error codes.
+    
+    Trying to register a handler on an instance now raises :exc:`ValueError`
 
 .. _upgrading-to-010: