diff --git a/en_US/installation/0-setup.dns.md b/en_US/installation/0-setup.dns.md
index 93847082..c6fa2afd 100644
--- a/en_US/installation/0-setup.dns.md
+++ b/en_US/installation/0-setup.dns.md
@@ -265,7 +265,9 @@ If you want to re-generate DKIM key, or need to generate one for new mail
domain, please check our another tutorial:
[Sign DKIM signature on outgoing emails for new mail domain](./sign.dkim.signature.for.new.domain.html).
-## [OPTIONAL] Register your mail domain in Google Postmaster Tools
+## Register your mail domain in Google Postmaster Tools
+
+This step is __optional__, but __higly recommended__.
Google Postmaster Tools web site:
If you want to re-generate DKIM key, or need to generate one for new mail domain, please check our another tutorial: Sign DKIM signature on outgoing emails for new mail domain.
-This step is optional, but higly recommended.
Google Postmaster Tools web site: https://postmaster.google.com, and Postmaster Tools FAQs.
It's very simple: just register your mail domain there, and they'll give you a