diff --git a/howto/1-completely.disable.amavisd.clamav.spamassassin.md b/howto/1-completely.disable.amavisd.clamav.spamassassin.md
index 1dce761d..3ad90226 100644
--- a/howto/1-completely.disable.amavisd.clamav.spamassassin.md
+++ b/howto/1-completely.disable.amavisd.clamav.spamassassin.md
@@ -31,7 +31,7 @@ If you want to completely disable spam and virus scanning services, steps:
 
 ```perl
 content_filter = smtp-amavis:[127.0.0.1]:10024
-receive_override_options = no_address_mappings
+receive_override_options = no_address_mappings  # <- it's ok if you don't have this line
 ```
 
 * Disable network services: Amavisd, ClamAV.
diff --git a/html/completely.disable.amavisd.clamav.spamassassin.html b/html/completely.disable.amavisd.clamav.spamassassin.html
index 5278ed0a..07f491e2 100644
--- a/html/completely.disable.amavisd.clamav.spamassassin.html
+++ b/html/completely.disable.amavisd.clamav.spamassassin.html
@@ -41,7 +41,7 @@
 <li>Comment out below two lines in Postfix config file <code>/etc/postfix/main.cf</code>, then restart Postfix service.</li>
 </ul>
 <pre><code class="perl">content_filter = smtp-amavis:[127.0.0.1]:10024
-receive_override_options = no_address_mappings
+receive_override_options = no_address_mappings  # &lt;- it's ok if you don't have this line
 </code></pre>
 
 <ul>