Update main.html

main/extensions/penPlus/main.html

@@ -5,6 +5,8 @@ <h1 class="centered">Pen+</h1>
   Welcome to the official documentation page for the Pen+ extension! This page covers everything in the extension itself.<br>
   If you would like something covering the <a href="">shader editor</a> check it's page, 
   or if you are looking for info about Pen+ addons and it's integration in other extensions please check <a href="">addons</a> section.
+
+  NOTE: THAT THIS IS STILL UNDER CONSTRUCTION
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