readme update

README.md

@@ -5,7 +5,7 @@
 [<img src="https://img.shields.io/badge/slack-LiteSpeed-blue.svg?logo=slack">](litespeedtech.com/slack) 
 [<img src="https://img.shields.io/twitter/follow/litespeedtech.svg?label=Follow&style=social">](https://twitter.com/litespeedtech)
 
-Install a lightweight WordPress container with OpenLiteSpeed Edge or Stable version on Ubuntu 18.04 Linux.
+Install a lightweight WordPress container with OpenLiteSpeed Edge or Stable version based on Ubuntu 18.04 Linux.
 
 ### Prerequisites
 1. [Install Docker](https://www.docker.com/)
@@ -151,15 +151,35 @@ bash bin/webadmin.sh [-U, --upgrade]
 ### Apply OWASP ModSecurity
 Enable OWASP `mod_secure` on the web server: 
 ```
-bash bin/webadmin.sh [-modsec|-sec] enable
+bash bin/webadmin.sh [-M, --mod-secure] enable
 ```
 Disable OWASP `mod_secure` on the web server: 
 ```
-bash bin/webadmin.sh [-modsec|-sec] disable
+bash bin/webadmin.sh [-M, --mod-secure] disable
 ```
+
 ### Accessing the Database
 After installation, you can use phpMyAdmin to access the database by visiting `http://127.0.0.1:8080` or `https://127.0.0.1:8443`. The default username is `root`, and the password is the same as the one you supplied in the `.env` file.
 
+## Customization
+If you want to customize the image by adding some packages, e.g. `lsphp74-pspell`, just extend it with a Dockerfile. 
+1. We can create a `custom` folder and a `custom/Dockerfile` file under the main project. 
+2. Add the following example code to `Dockerfile` under the custom folder
+```
+FROM litespeedtech/openlitespeed:latest
+RUN apt-get update && apt-get install lsphp74-pspell
+```
+3. Add `build: ./custom` line under the "image: litespeedtech" of docker-composefile. So it will looks like this 
+```
+  litespeed:
+    image: litespeedtech/openlitespeed:${OLS_VERSION}-${PHP_VERSION}
+    build: ./custom
+```
+4. Build and start it with command:
+```
+docker-compose up --build
+```
+
 ## Support & Feedback
 If you still have a question after using OpenLiteSpeed Docker, you have a few options.
 * Join [the GoLiteSpeed Slack community](litespeedtech.com/slack) for real-time discussion