Clarify the change of enc -S behavior in 3.0
Fixes
@@ -256,6 +256,19 @@ All RC2 ciphers have the same key and effective key length.
Blowfish and RC5 algorithms use a 128 bit key.
+Please note that OpenSSL 3.0 changed the effect of the B<-S> option.
+Any explicit salt value specified via this option is no longer prepended to the
+ciphertext when encrypting, and must again be explicitly provided when decrypting.
+Conversely, when the B<-S> option is used during decryption, the ciphertext
+is expected to not have a prepended salt value.
+
+When using OpenSSL 3.0 or later to decrypt data that was encrypted with an
+explicit salt under OpenSSL 1.1.1 do not use the B<-S> option, the salt will
+then be read from the ciphertext.
+To generate ciphertext that can be decrypted with OpenSSL 1.1.1 do not use
+the B<-S> option, the salt will be then be generated randomly and prepended
+to the output.
+
=head1 SUPPORTED CIPHERS
Note that some of these ciphers can be disabled at compile time
