Add a second TXT entry for domain verification

doc/user/project/pages/custom_domains_ssl_tls_certification/index.md

@@ -190,6 +190,22 @@ Expect the output:
 _gitlab-pages-verification-code.<YOUR-PAGES-DOMAIN>. 300 IN TXT "gitlab-pages-verification-code=<YOUR-VERIFICATION-CODE>"
 ```
 
+In some cases it can help to add the verification code with the same domain name as you are trying to register.
+
+For a root domain:
+
+| From                                              | DNS Record | To                     |
+| ------------------------------------------------- | ---------- | ---------------------- |
+| `example.com`                                     | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
+| `_gitlab-pages-verification-code.example.com`     | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
+
+For a subdomain:
+
+| From                                              | DNS Record | To                     |
+| ------------------------------------------------- | ---------- | ---------------------- |
+| `www.example.com`                                 | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
+| `_gitlab-pages-verification-code.www.example.com` | TXT        | `gitlab-pages-verification-code=00112233445566778899aabbccddeeff` |
+
 ### Adding more domain aliases
 
 You can add more than one alias (custom domains and subdomains) to the same project.