update usage

libraries/common

@@ -269,9 +269,13 @@ function showEzsyncUsage() {
 	echo -e "USAGE: ezsync [parameters]"
 	echo -e "  -c\t--cleanlog\tclears log file; not working with -p and -P"
 	echo -e "  -h\t--help\t\tdisplays this screen and exits immediately"
+	echo -e "  -n\t--nosync\tspecifies the ebuilds source that will be omitted"
 	echo -e "  -p\t--purge\t\tclears temporary folder"
 	echo -e "  -P\t--purgeonly\tclears temporary folder and exits"
 	echo -e "  -s\t--syscheck\tperforms prerequisites check only"
+	echo -e "\nEXAMPLES:"
+	echo -e "   ezsync -c -n mainline"
+	echo -e "   ezsync -n mainline -n my_repo1"
 	echo -e "\n"
 	exit 0
 }