diff --git a/en_US/upgrade/0-upgrade.dovecot.2.2-2.3.md b/en_US/upgrade/0-upgrade.dovecot.2.2-2.3.md
index e208ccee..bbf3cbba 100644
--- a/en_US/upgrade/0-upgrade.dovecot.2.2-2.3.md
+++ b/en_US/upgrade/0-upgrade.dovecot.2.2-2.3.md
@@ -99,3 +99,38 @@ CREATE INDEX idx_mailbox_enableimaptls ON mailbox (enableimaptls);
ALTER TABLE mailbox ADD COLUMN enablepop3tls INT2 NOT NULL DEFAULT 1;
CREATE INDEX idx_mailbox_enablepop3tls ON mailbox (enablepop3tls);
```
+
+### LDAP changes for OpenLDAP/ldapd backends
+
+We need to add new ldap attribute/value pairs for existing mail users.
+
+* Download script used to update existing mail users:
+
+```
+cd /root/
+wget https://bitbucket.org/zhb/iredmail/raw/default/extra/update/update-ldap-dovecot-2.3.py
+```
+
+* Open downloaded file `update-ldap-dovecot-2.3.py`, set LDAP server
+ related settings in this file. For example:
+
+```
+# Part of file: update-ldap-dovecot-2.3.py
+
+uri = 'ldap://127.0.0.1:389'
+basedn = 'o=domains,dc=example,dc=com'
+bind_dn = 'cn=vmailadmin,dc=example,dc=com'
+bind_pw = 'password'
+```
+
+You can find required LDAP credential in iRedAdmin config file or
+`iRedMail.tips` file under your iRedMail installation directory. Using either
+`cn=Manager,dc=xx,dc=xx` or `cn=vmailadmin,dc=xx,dc=xx` as bind dn is ok, both
+of them have read-write privilege to update mail accounts.
+
+* Execute this script, it will add required data:
+
+```
+# python update-ldap-dovecot-2.3.py
+```
+
diff --git a/html/upgrade.dovecot.2.2-2.3.html b/html/upgrade.dovecot.2.2-2.3.html
index a51d9814..fec63609 100644
--- a/html/upgrade.dovecot.2.2-2.3.html
+++ b/html/upgrade.dovecot.2.2-2.3.html
@@ -111,6 +111,37 @@ ALTER TABLE mailbox ADD COLUMN enableimaptls INT2 NOT NULL DEFAULT 1;
CREATE INDEX idx_mailbox_enableimaptls ON mailbox (enableimaptls);
ALTER TABLE mailbox ADD COLUMN enablepop3tls INT2 NOT NULL DEFAULT 1;
CREATE INDEX idx_mailbox_enablepop3tls ON mailbox (enablepop3tls);
+
+
+LDAP changes for OpenLDAP/ldapd backends
+We need to add new ldap attribute/value pairs for existing mail users.
+
+- Download script used to update existing mail users:
+
+cd /root/
+wget https://bitbucket.org/zhb/iredmail/raw/default/extra/update/update-ldap-dovecot-2.3.py
+
+
+
+- Open downloaded file
update-ldap-dovecot-2.3.py, set LDAP server
+ related settings in this file. For example:
+
+# Part of file: update-ldap-dovecot-2.3.py
+
+uri = 'ldap://127.0.0.1:389'
+basedn = 'o=domains,dc=example,dc=com'
+bind_dn = 'cn=vmailadmin,dc=example,dc=com'
+bind_pw = 'password'
+
+
+You can find required LDAP credential in iRedAdmin config file or
+iRedMail.tips file under your iRedMail installation directory. Using either
+cn=Manager,dc=xx,dc=xx or cn=vmailadmin,dc=xx,dc=xx as bind dn is ok, both
+of them have read-write privilege to update mail accounts.
+
+- Execute this script, it will add required data:
+
+# python update-ldap-dovecot-2.3.py