diff --git a/web-nginx-mysql/alpine/README.md b/web-nginx-mysql/alpine/README.md
index 3d5d7d0e2..b9cae9599 100644
--- a/web-nginx-mysql/alpine/README.md
+++ b/web-nginx-mysql/alpine/README.md
@@ -196,7 +196,7 @@ The variable allows to specify a custom list of valid ciphers. The format of the
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/web-nginx-mysql/centos/README.md b/web-nginx-mysql/centos/README.md
index 3d5d7d0e2..b9cae9599 100644
--- a/web-nginx-mysql/centos/README.md
+++ b/web-nginx-mysql/centos/README.md
@@ -196,7 +196,7 @@ The variable allows to specify a custom list of valid ciphers. The format of the
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/web-nginx-mysql/ubuntu/README.md b/web-nginx-mysql/ubuntu/README.md
index 3d5d7d0e2..b9cae9599 100644
--- a/web-nginx-mysql/ubuntu/README.md
+++ b/web-nginx-mysql/ubuntu/README.md
@@ -196,7 +196,7 @@ The variable allows to specify a custom list of valid ciphers. The format of the
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/web-nginx-pgsql/alpine/README.md b/web-nginx-pgsql/alpine/README.md
index 0f75b9acd..82fa63502 100644
--- a/web-nginx-pgsql/alpine/README.md
+++ b/web-nginx-pgsql/alpine/README.md
@@ -188,7 +188,7 @@ The variable allows to activate host verification. Available since 5.0.0.
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/web-nginx-pgsql/centos/README.md b/web-nginx-pgsql/centos/README.md
index 0f75b9acd..82fa63502 100644
--- a/web-nginx-pgsql/centos/README.md
+++ b/web-nginx-pgsql/centos/README.md
@@ -188,7 +188,7 @@ The variable allows to activate host verification. Available since 5.0.0.
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/web-nginx-pgsql/ubuntu/README.md b/web-nginx-pgsql/ubuntu/README.md
index 0f75b9acd..82fa63502 100644
--- a/web-nginx-pgsql/ubuntu/README.md
+++ b/web-nginx-pgsql/ubuntu/README.md
@@ -188,7 +188,7 @@ The variable allows to activate host verification. Available since 5.0.0.
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.
 
diff --git a/zabbix-appliance/rhel/README.md b/zabbix-appliance/rhel/README.md
index 3734d9808..1ddf003c3 100644
--- a/zabbix-appliance/rhel/README.md
+++ b/zabbix-appliance/rhel/README.md
@@ -199,7 +199,7 @@ The volume allows to add new MIB files. It does not support subdirectories, all
 
 ### ``/etc/ssl/nginx``
 
-The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains two files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
+The volume allows to enable HTTPS for the Zabbix web interface. The volume must contains three files ``ssl.crt``, ``ssl.key`` and ``dhparam.pem`` prepared for Nginx SSL connections.
 
 Please follow official Nginx [documentation](http://nginx.org/en/docs/http/configuring_https_servers.html) to get more details about how to create certificate files.