dnsdist: Document that h2o support is no longer built by default

diff --git a/pdns/dnsdistdist/docs/upgrade_guide.rst b/pdns/dnsdistdist/docs/upgrade_guide.rst
index 9efab181f360a57051a2c2a8f88f409873298f93..661370f6db1d7ce5e7f4044796cca6dc63503f6e 100644 (file)
--- a/pdns/dnsdistdist/docs/upgrade_guide.rst
+++ b/pdns/dnsdistdist/docs/upgrade_guide.rst
@@ -5,7 +5,7 @@ Upgrade Guide
 --------------
 
 dnsdist now supports a new library for dealing with incoming DNS over HTTPS queries: ``nghttp2``. The previously used library, ``h2o``, can still be used
-but is now deprecated and will be removed in the future, as it is unfortunately no longer maintained in a way that is suitable for use as a library
+but is now deprecated, disabled by default (see ``--with-h2o`` to enable it back) and will be removed in the future, as it is unfortunately no longer maintained in a way that is suitable for use as a library
 (see https://github.com/h2o/h2o/issues/3230). See the ``library`` parameter on the :func:`addDOHLocal` directive for more information on how to select
 the library used when dnsdist is built with support for both ``h2o`` and ``nghttp2``. The default is now ``nghttp2`` whenever possible.
 Note that ``nghttp2`` only supports HTTP/2, and not HTTP/1, while ``h2o`` supported both. This is not an issue for actual DNS over HTTPS clients that