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-rw-r--r--doc/apps/s_client.pod8
1 files changed, 8 insertions, 0 deletions
diff --git a/doc/apps/s_client.pod b/doc/apps/s_client.pod
index 6468999b25..afcba281e6 100644
--- a/doc/apps/s_client.pod
+++ b/doc/apps/s_client.pod
@@ -68,6 +68,7 @@ B<openssl> B<s_client>
[B<-no_tls1_1>]
[B<-no_tls1_2>]
[B<-fallback_scsv>]
+[B<-async>]
[B<-bugs>]
[B<-cipher cipherlist>]
[B<-serverpref>]
@@ -277,6 +278,13 @@ work if TLS is turned off.
Send TLS_FALLBACK_SCSV in the ClientHello.
+=item B<-async>
+
+switch on asynchronous mode. Cryptographic operations will be performed
+asynchronously. This will only have an effect if an asynchronous capable engine
+is also used via the B<-engine> option. For test purposes the dummy async engine
+(dasync) can be used (if available).
+
=item B<-bugs>
there are several known bug in SSL and TLS implementations. Adding this