diff --git a/README.md b/README.md
index d6185af..e71a616 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Old instance will be disabled and new starts without reinstallation very quickly
 
 **Command line arguments:**
 
-- `-s` or `--subnet` - IPv6 [subnet](https://docs.netgate.com/pfsense/en/latest/network/ipv6/subnets.html), fully dedicated for your server. `48` or `64`, default `64`
+- `-s` or `--subnet` - IPv6 [subnet](https://docs.netgate.com/pfsense/en/latest/network/ipv6/subnets.html), fully dedicated for your server. `16`, `32`, `48`, `64`, `80`, `96` or `112`, default `64`
 - `-c` or `--proxy-count` - The total number of proxies you want to have (from 1 to 10000)
 - `-t` or `--proxies-type` - Proxies type - `http` or `socks5`. Default `http`, if no value provided
 - `-u` or `--username` - All proxies auth login
diff --git a/ipv6-proxy-server.sh b/ipv6-proxy-server.sh
index aff7e6e..f13dea7 100644
--- a/ipv6-proxy-server.sh
+++ b/ipv6-proxy-server.sh
@@ -6,7 +6,7 @@ if [ "$EUID" -ne 0 ];
 fi;
 
 # Program help info for users
-function usage() { echo "Usage: $0 [-s | --subnet <32|48|64> proxy subnet (default 64)] 
+function usage() { echo "Usage: $0 [-s | --subnet <16|32|48|64|80|96|112> proxy subnet (default 64)] 
                           [-c | --proxy-count <number> count of proxies] 
                           [-u | --username <string> proxy auth username] 
                           [-p | --password <string> proxy password]
@@ -103,7 +103,7 @@ if [ $proxies_type != "http" ] && [ $proxies_type != "socks5" ] ; then
   usage;
 fi;
 
-if [ $subnet != 64 ] && [ $subnet != 48 ] && [ $subnet != 32 ]; then
+if [ $(expr $subnet % 16) != 0 ]; then
   echo_log_err "Error: invalid value of '-s' (subnet) parameter";
   usage;
 fi;