diff --git a/content/codeberg-pages/using-custom-domain.md b/content/codeberg-pages/using-custom-domain.md
index 968fd29..125bedf 100644
--- a/content/codeberg-pages/using-custom-domain.md
+++ b/content/codeberg-pages/using-custom-domain.md
@@ -59,6 +59,16 @@ There are several ways DNS records for your website can be setup in order to tel
 
 *We assume for the following description, that you want to serve your website with and without www in front. If you are on a subdomain already (like myproject.yourdomain.com), you can skip the `www.yourdomain.com` CNAME entry.*
 
+{% admonition "Warning" %}
+
+When setting up DNS records with many registrars, any domain added to the `Domain` or `Host` option is automatically appended onto the domain the records are being made for.
+
+For example, if your domain is `example.com`, entering `www` will mean the record refers to `www.example.com`.
+
+Therefore, in this guide, you may need to replace references to just your domain name (e.g. `example.com`) with `@` and `anything.example.com` (i.e. any subdomain) with just `anything`.
+
+{% endadmonition %}
+
 **Option 1: CNAME record**
 
 The easiest and recommended way is to just setup a CNAME record for your domain, pointing to the mentioned above locations. In the end, it should look like this: