[master] b40e69b Explain why 5.1.1 is necessary

[Poul-Henning Kamp]

commit b40e69be88ee0e5ec16ef2dcd865153987279fac
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Thu Mar 16 13:00:50 2017 +0000

    Explain why 5.1.1 is necessary

diff --git a/doc/changes.rst b/doc/changes.rst
index 376ac19..5d57de4 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -2,7 +2,8 @@
 Varnish Cache trunk (unreleased)
 ================================
 
-* No changes.
+* Fix bug introduced by stubborn old bugger right before release
+  5.1.0 was cut.
 
 ================================
 Varnish Cache 5.1.0 (2017-03-15)