chore: mention that code should be a standalone program

faq.html

@@ -55,8 +55,9 @@ <h4 id="auth"><a href="#auth">#</a> Why do I need to authenticate?</h4>
         <h4 id="key-use"><a href="#key-use">#</a> How is the key used?</h4>
         <p>Your key is used to meter your usage. It is automatically used at <a href="codesheet.html">CodeSheet</a> and for browser extensions, you will need to provide it in extension options.</p>
 
-        <h4 id="limits"><a href="#limits">#</a> What are the limits?</h4>
+        <h4 id="limits"><a href="#limits">#</a> What are the limitations?</h4>
         <ul>
+          <li>Code should be a standalone program</li>
           <li>1000 runs per month</li>
           <li>5 seconds time limit for each run</li>
           <li>No internet access from code</li>