--- util.c
+++ util.c
@@ -214,6 +214,7 @@
 	printf("  -s\tuse SSL to transfer mail\n");
 	printf("  -S\tuse STARTTLS to connect to server\n");
 #endif
+	printf("  -t\temail address to send in RCPT TO request\n");
 	printf("  -U\tSASL user\n");
 	printf("  -P\tSASL password\n");
 	printf("  -M\t{l,p} SASL mechanism to use: l - login (default) , p - plain\n");