Index: docs/manual/mod/mod_ssl.xml
===================================================================
--- docs/manual/mod/mod_ssl.xml (revision 1675271)
+++ docs/manual/mod/mod_ssl.xml (working copy)
@@ -2650,4 +2650,32 @@
</usage>
</directivesynopsis>

+<directivesynopsis>
+<name>SSLAlpnPreference</name>
+<description>Configure preference during application layer protocol negotiation</description>
+<syntax>SSLAlpnPreference <em>alpn-proto</em> ... </syntax>
+<default>SSLAlpnPreference <em>none</em></default>
+<contextlist><context>server config</context>
+<context>virtual host</context></contextlist>
+<compatibility>Available in httpd 2.4.16 and later</compatibility>
+
+<usage>
+<p>This directive overrides preferences by implementations of application layer
+protocols during negotiation. The protocol specified first gets precedence
+over later (or unspecified) protocols. This list is evaluated against 
+client capabilities.</p>
+
+<example><title>Examples</title>
+<highlight language="config">
+SSLAlpnPreference h2 spdy/3
+</highlight>
+<p>For clients which support both protocosl, h2 will be selected. For
+clients which only support spd/3, that one will be chosed. If a client
+supports only protocol X and there is support for X in httpd, the
+negotiation will select X.</p>
+</example>
+</usage>
+</directivesynopsis>
+
+
</modulesynopsis>