Mention multiple recipients in man page

yadm.1

@@ -427,6 +427,7 @@ By default, the first "gpg" found in $PATH is used.
 Asymmetrically encrypt files with a gpg public/private key pair.
 Provide a "key ID" to specify which public key to encrypt with.
 The key must exist in your public keyrings.
+Multiple recipients can be specified (separated by space).
 If left blank or not provided, symmetric encryption is used instead.
 If set to "ASK", gpg will interactively ask for recipients.
 See the ENCRYPTION section for more details.