Mention the preference for https:// in the "Guidelines for Creating Packages"

index.html

@@ -2340,6 +2340,10 @@ local-pkg-list: $(LOCAL_PKG_LIST)</pre>
     &lt;td class="package"&gt;gettext&lt;/td&gt;
     &lt;td class="website"&gt;&lt;a href="https://www.gnu.org/software/gettext/"&gt;gettext&lt;/a&gt;&lt;/td&gt;
 &lt;/tr&gt;</pre>
+        <p>
+            Always look for the SSL version of a website, that is,
+            prefer <code>https://</code> URLs over <code>http://</code> URLs.
+        </p>
     </li>
 
     <li>