Update the node join instruction to reference "username"
related to
@@ -78,7 +78,7 @@ var registerWebAPITemplate = template.Must(
<p>
Run the command below in the headscale server to add this machine to your network:
</p>
- <pre><code>headscale -n NAMESPACE nodes register --key {{.Key}}</code></pre>
+ <pre><code>headscale nodes register --user USERNAME --key {{.Key}}</code></pre>
</body>
</html>
`))
