update description

guide.html

@@ -418,7 +418,7 @@
         <p>Twister ecosystem has no internal currency and market cost, the mining process make your promotional messages text permanently saved in blockchain only (comparing to the regular publications that stored in DHT)</p>
         <a class="position-t--48 h-32 d-block" id="network-support-port-open"></a>
         <h3 class="f-size-20 mb-16 px-12 f-normal">Port open</h3>
-        <p class="mb-16">If you have dedicated IP, or twister node running in the alternative network over NAT (like <a class="c-3" href="https://yggdrasil-network.github.io">Yggdrasil</a>) please open following ports in the firewall to share data collected with other peers:</p>
+        <p class="mb-16">If you have dedicated IP, or twister node running in the alternative network over NAT (like <a class="c-3" href="https://yggdrasil-network.github.io">Yggdrasil</a>) please open following ports in the firewall rules to share data collected with other peers:</p>
         <ul class="mb-16 ml-16">
           <li>28333 - TCP *</li>
           <li>29333 - TCP+UDP *</li>