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-rw-r--r--doc/apps/s_server.pod9
1 files changed, 7 insertions, 2 deletions
diff --git a/doc/apps/s_server.pod b/doc/apps/s_server.pod
index 6f4acb7006ff..fa17488d9173 100644
--- a/doc/apps/s_server.pod
+++ b/doc/apps/s_server.pod
@@ -62,6 +62,7 @@ B<openssl> B<s_server>
[B<-status_verbose>]
[B<-status_timeout nsec>]
[B<-status_url url>]
+[B<-alpn protocols>]
[B<-nextprotoneg protocols>]
=head1 DESCRIPTION
@@ -327,9 +328,13 @@ sets a fallback responder URL to use if no responder URL is present in the
server certificate. Without this option an error is returned if the server
certificate does not contain a responder address.
-=item B<-nextprotoneg protocols>
+=item B<-alpn protocols>, B<-nextprotoneg protocols>
-enable Next Protocol Negotiation TLS extension and provide a
+these flags enable the
+Enable the Application-Layer Protocol Negotiation or Next Protocol
+Negotiation extension, respectively. ALPN is the IETF standard and
+replaces NPN.
+The B<protocols> list is a
comma-separated list of supported protocol names.
The list should contain most wanted protocols first.
Protocol names are printable ASCII strings, for example "http/1.1" or