diff --git a/doc/man1/s_client.pod b/doc/man1/s_client.pod
index 882f74b4184b3bdc09de8158476785adf5ca2a8f..5414ffa41edfd8abcfb45002c445d801640263fa 100644
--- a/doc/man1/s_client.pod
+++ b/doc/man1/s_client.pod
@@ -378,12 +378,14 @@ Can be used to override the implicit B<-ign_eof> after B<-quiet>.
 =item B<-psk_identity identity>
 
 Use the PSK identity B<identity> when using a PSK cipher suite.
+The default value is "Client_identity" (without the quotes).
 
 =item B<-psk key>
 
 Use the PSK key B<key> when using a PSK cipher suite. The key is
 given as a hexadecimal number without leading 0x, for example -psk
 1a2b3c4d.
+This option must be provided in order to use a PSK cipher.
 
 =item B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3>, B<-no_ssl3>, B<-no_tls1>, B<-no_tls1_1>, B<-no_tls1_2>, B<-no_tls1_3>
 
diff --git a/doc/man1/s_server.pod b/doc/man1/s_server.pod
index b5245d8b4d8fe8cf8cb46b3a8adec787edf6dfda..db712f90e997a60f374a8ba4468963e8be30c51a 100644
--- a/doc/man1/s_server.pod
+++ b/doc/man1/s_server.pod
@@ -344,6 +344,7 @@ identity is the string "Client_identity".
 Use the PSK key B<key> when using a PSK cipher suite. The key is
 given as a hexadecimal number without leading 0x, for example -psk
 1a2b3c4d.
+This option must be provided in order to use a PSK cipher.
 
 =item B<-ssl2>, B<-ssl3>, B<-tls1>, B<-tls1_1>, B<-tls1_2>, B<-tls1_3>, B<-no_ssl2>, B<-no_ssl3>, B<-no_tls1>, B<-no_tls1_1>, B<-no_tls1_2>, B<-no_tls1_3>