diff --git a/html/install.iredmail.on.openbsd.html b/html/install.iredmail.on.openbsd.html
index 1194f0b6..e938b748 100644
--- a/html/install.iredmail.on.openbsd.html
+++ b/html/install.iredmail.on.openbsd.html
@@ -62,19 +62,16 @@ and it may not be working as expected.</p>
   prompt you to choose different versions of binary packages, please choose
   the one described below:</p>
 <ul>
-<li><code>php-5.6.x</code> is recommended, but it's ok if you want to use another version</li>
-<li>choose <code>postfix-2.11.x</code></li>
 <li>choose <code>p5-Mail-SPF</code>, NOT <code>p5-Mail-SPF-Query</code></li>
 </ul>
 </li>
 <li>
-<p>Apache chroot is disabled by default, required by iRedAdmin - the web-based
-  admin panel.</p>
+<p>Nginx is used as web server.</p>
 </li>
 <li>PF is enabled by default, with basic rules for ssh and mail services.</li>
 <li>System built-in <a href="http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/spamd.8"><code>spamd(8)</code></a> is enabled by default for greylisting,
   whitelisting, blacklisting.</li>
-<li>Sendmail and OpenSMTPd are disabled by default, replaced by Postfix.</li>
+<li>OpenSMTPd are disabled by default, replaced by Postfix.</li>
 </ul>
 <h2 id="preparations">Preparations</h2>
 <h3 id="set-a-fully-qualified-domain-name-fqdn-hostname-on-your-server">Set a fully qualified domain name (FQDN) hostname on your server</h3>
diff --git a/html/upgrade.iredmail.0.9.0-0.9.1.html b/html/upgrade.iredmail.0.9.0-0.9.1.html
index b88b9ff6..ccfca595 100644
--- a/html/upgrade.iredmail.0.9.0-0.9.1.html
+++ b/html/upgrade.iredmail.0.9.0-0.9.1.html
@@ -62,7 +62,7 @@
 <p><strong>WARNING: Still working in progress, do <em>NOT</em> apply it.</strong></p>
 <h2 id="changelog">ChangeLog</h2>
 <ul>
-<li>2015-05-03: [All backends] Fixed: Amavisd cannot ban zipped <code>.exe</code> attachment file.</li>
+<li>2015-05-03: [All backends] [RHEL/CentOS] Fixed: Amavisd cannot ban zipped <code>.exe</code> attachment file.</li>
 <li>2015-04-21: [All backends] [Debian/Ubuntu] Fixed: Amavisd cannot detect <code>.exe</code> file in rar compressed attachment.</li>
 <li>2015-04-21: [All backends] Fixed: Incorrect log file and owner/group in logrotate config file: /etc/logrotate.d/policyd.</li>
 <li>2015-04-06: [All backends] Make Dovecot subscribe newly created folder automatically.</li>
@@ -189,6 +189,7 @@ log). If your user's password was cracked by spammer, spammer can use this
 account to bypass smtp authentication, but with a null sender in <code>From:</code>
 header, throttling won't be triggered.</p>
 <h3 id="fixed-amavisd-cannot-ban-zipped-exe-attachment-file">Fixed: Amavisd cannot ban zipped <code>.exe</code> attachment file.</h3>
+<p>Note: this is applicable to only RHEL/CentOS.</p>
 <p>Amavisd on some Linux/BSD distribution uses <code>$banned_namepath_re</code>
 instead of <code>$banned_filename_re</code> to check banned file types, but it
 (<code>$banned_namepath_re</code>) was not defined, so we define some blocked file
@@ -214,7 +215,7 @@ types here.</p>
 #   - N: suggested (MIME) name. e.g. my_docum.zip.
 
 $banned_namepath_re = new_RE(
-   [qr'T=(exe|exe-ms|dat|lha|cab|dll)\t'xmi =&gt; 'DISCARD'],   # banned file(1) types
+   [qr'T=(exe|exe-ms|lha|cab|dll)\t'xmi =&gt; 'DISCARD'],   # banned file(1) types
    [qr'T=(pif|scr)\t'xmi =&gt; 'DISCARD'],                      # banned extensions - rudimentary
    [qr'T=ani\t'xmi =&gt; 'DISCARD'],                            # banned animated cursor file(1) type
    [qr'T=(mim|b64|bhx|hqx|xxe|uu|uue)\t'xmi =&gt; 'DISCARD'],   # banned extension - WinZip vulnerab.
diff --git a/installation/5-install.iredmail.on.openbsd.md b/installation/5-install.iredmail.on.openbsd.md
index d815ea3f..7281311b 100644
--- a/installation/5-install.iredmail.on.openbsd.md
+++ b/installation/5-install.iredmail.on.openbsd.md
@@ -32,16 +32,13 @@ Notes:
   prompt you to choose different versions of binary packages, please choose
   the one described below:
 
-    * `php-5.6.x` is recommended, but it's ok if you want to use another version
-    * choose `postfix-2.11.x`
     * choose `p5-Mail-SPF`, NOT `p5-Mail-SPF-Query`
 
-* Apache chroot is disabled by default, required by iRedAdmin - the web-based
-  admin panel.
+* Nginx is used as web server.
 * PF is enabled by default, with basic rules for ssh and mail services.
 * System built-in [`spamd(8)`](http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/spamd.8) is enabled by default for greylisting,
   whitelisting, blacklisting.
-* Sendmail and OpenSMTPd are disabled by default, replaced by Postfix.
+* OpenSMTPd are disabled by default, replaced by Postfix.
 
 ## Preparations
 
diff --git a/upgrade/0-upgrade.iredmail.0.9.0-0.9.1.md b/upgrade/0-upgrade.iredmail.0.9.0-0.9.1.md
index ac02f014..f13e2840 100644
--- a/upgrade/0-upgrade.iredmail.0.9.0-0.9.1.md
+++ b/upgrade/0-upgrade.iredmail.0.9.0-0.9.1.md
@@ -7,7 +7,7 @@ __WARNING: Still working in progress, do _NOT_ apply it.__
 
 ## ChangeLog
 
-* 2015-05-03: [All backends] Fixed: Amavisd cannot ban zipped `.exe` attachment file.
+* 2015-05-03: [All backends] [RHEL/CentOS] Fixed: Amavisd cannot ban zipped `.exe` attachment file.
 * 2015-04-21: [All backends] [Debian/Ubuntu] Fixed: Amavisd cannot detect `.exe` file in rar compressed attachment.
 * 2015-04-21: [All backends] Fixed: Incorrect log file and owner/group in logrotate config file: /etc/logrotate.d/policyd.
 * 2015-04-06: [All backends] Make Dovecot subscribe newly created folder automatically.
@@ -152,6 +152,8 @@ header, throttling won't be triggered.
 
 ### Fixed: Amavisd cannot ban zipped `.exe` attachment file.
 
+Note: this is applicable to only RHEL/CentOS.
+
 Amavisd on some Linux/BSD distribution uses `$banned_namepath_re`
 instead of `$banned_filename_re` to check banned file types, but it
 (`$banned_namepath_re`) was not defined, so we define some blocked file
@@ -179,7 +181,7 @@ Please append below settings in Amavisd config file, before the last line
 #   - N: suggested (MIME) name. e.g. my_docum.zip.
 
 $banned_namepath_re = new_RE(
-   [qr'T=(exe|exe-ms|dat|lha|cab|dll)\t'xmi => 'DISCARD'],   # banned file(1) types
+   [qr'T=(exe|exe-ms|lha|cab|dll)\t'xmi => 'DISCARD'],   # banned file(1) types
    [qr'T=(pif|scr)\t'xmi => 'DISCARD'],                      # banned extensions - rudimentary
    [qr'T=ani\t'xmi => 'DISCARD'],                            # banned animated cursor file(1) type
    [qr'T=(mim|b64|bhx|hqx|xxe|uu|uue)\t'xmi => 'DISCARD'],   # banned extension - WinZip vulnerab.