diff --git a/en_US/howto/use.a.bought.ssl.certificate.md b/en_US/howto/use.a.bought.ssl.certificate.md
index 28437294..68ff2502 100644
--- a/en_US/howto/use.a.bought.ssl.certificate.md
+++ b/en_US/howto/use.a.bought.ssl.certificate.md
@@ -164,7 +164,7 @@ Restarting Nginx service is required.
 ### OpenLDAP
 
 > If OpenLDAP is listening on localhost and not accessible from external
-> network, this could be optional setup.
+> network, this is OPTIONAL.
 
 * On Red Hat and CentOS, it's defined in `/etc/openldap/slapd.conf`.
 * On Debian and Ubuntu, it's defined in `/etc/ldap/slapd.conf`.
@@ -216,7 +216,7 @@ ldapsearch -x -W \
 ### MySQL, MariaDB
 
 > If MySQL/MariaDB is listening on localhost and not accessible from external
-> network, this could be optional setup.
+> network, this is OPTIONAL.
 
 * On Red Hat and CentOS, it's defined in `/etc/my.cnf`
 * On Debian and Ubuntu, it's defined in `/etc/mysql/my.cnf`.
diff --git a/html/use.a.bought.ssl.certificate.html b/html/use.a.bought.ssl.certificate.html
index 1c3a81e5..b3e90f53 100644
--- a/html/use.a.bought.ssl.certificate.html
+++ b/html/use.a.bought.ssl.certificate.html
@@ -178,7 +178,7 @@ certificates in the combined file:</p>
 <h3 id="openldap">OpenLDAP</h3>
 <blockquote>
 <p>If OpenLDAP is listening on localhost and not accessible from external
-network, this could be optional setup.</p>
+network, this is OPTIONAL.</p>
 </blockquote>
 <ul>
 <li>On Red Hat and CentOS, it's defined in <code>/etc/openldap/slapd.conf</code>.</li>
@@ -226,7 +226,7 @@ error message like <code>Peer's Certificate issuer is not recognized</code>.</p>
 <h3 id="mysql-mariadb">MySQL, MariaDB</h3>
 <blockquote>
 <p>If MySQL/MariaDB is listening on localhost and not accessible from external
-network, this could be optional setup.</p>
+network, this is OPTIONAL.</p>
 </blockquote>
 <ul>
 <li>On Red Hat and CentOS, it's defined in <code>/etc/my.cnf</code></li>