+The default theme of Irssi SILC Client shows the digital signed
+messages with [S] at start of the nickname who sent the message, when
+the message was successfully verified, [?] if the message could not
+be verified since the public key of the sender isn't cached locally,
+or [F] if the signature verificationn failed. If you do not have
+the sender's public key you can fetch it with GETKEY command.
+
+Examples: