diff --git a/sonyflake.go b/sonyflake.go
index c88c464..2db3325 100644
--- a/sonyflake.go
+++ b/sonyflake.go
@@ -178,7 +178,7 @@ func privateIPv4(interfaceAddrs types.InterfaceAddrs) (net.IP, error) {
 }
 
 func isPrivateIPv4(ip net.IP) bool {
-	// Allow private IP subnets (RFC1918) or link local (RFC3927)
+	// Allow private IP addresses (RFC1918) and link-local addresses (RFC3927)
 	return ip != nil &&
 		(ip[0] == 10 || ip[0] == 172 && (ip[1] >= 16 && ip[1] < 32) || ip[0] == 192 && ip[1] == 168 || ip[0] == 169 && ip[1] == 254)
 }