diff --git a/README.md b/README.md
index 15194c264229a0fe6680fd32a00f24a02ca52dca..d2802160eae140183f0ea1267064df96876aba71 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,12 @@
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-**Stanford OpenLDAP in Container**
+*Stanford OpenLDAP in Container*
 
 - [Stanford OpenLDAP in Container](#stanford-openldap-in-container)
 - [Get and setup personal drone token](#get-and-setup-personal-drone-token)
 - [Turn on the ci job defined in .drone.yml](#turn-on-the-ci-job-defined-in-droneyml)
-- [Update ldap image](#update-ldap-image)
-  - [Verify the configuration env defined in env.sh, make sure all the key files are accessible](#verify-the-configuration-env-defined-in-envsh-make-sure-all-the-key-files-are-accessible)
-  - [Manual push to Google container registry](#manual-push-to-google-container-registry)
+- [Update OpenLdap image](#update-openldap-image)
+    - [Manual push to Google container registry](#manual-push-to-google-container-registry)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
@@ -15,35 +14,38 @@
 
 # Stanford OpenLDAP in Container
 
-This repository contains instructions how to build and publish docker-ldap image to
+This repository contains instructions on how to build and publish docker-openldap image to
 Google Container Registry.
 
-This repo supports [DroneCI](https://drone.svc.stanford.edu/authnz/docker-openldap).
+This repository supports [DroneCI](https://drone.svc.stanford.edu/authnz/docker-openldap).
 
 # Get and setup personal drone token
 
-Drone CLI requires access token to talk to drone server.
+Drone CLI requires access token to authenticate to a drone server.
 
-Please get your [personal token](https://drone.svc.stanford.edu/account/token),
-and save the the token to ${HOME}/.drone-token file.
+You can get your [personal token](https://drone.svc.stanford.edu/account/token),
+and save the token to ${HOME}/.drone-token file.
 
-_NOTE_: Do not add newline at the end of the token.
+_NOTE_: Make sure you do not have newline at the end of the token file. You will get authentication failure.
 
 # Turn on the ci job defined in .drone.yml
 
-NOTE: This will setup the hook for CI trigger. This only needs to be done once. You probably don't
+NOTE: This will setup the hook for CI trigger. It needs to be done only once. You don't
 need to run this if it's been setup already.
 
-```
+```console
 $ make drone-setup
+...
 ```
 
 See .drone.yml for build steps and triggers.
 
-# Update openldap image
+# Update OpenLdap image
+
+To upgrade software version and base image, edit build.sh, env.sh to change `OPENLDAP_VERSION`, and edit `.drone.yml` to change tag.
 
 If you make changes to the repository, you can test build manually. If the build is successful,
-then commit and push changes to the docker-ldap repository. It will trigger CI/CD to build and upload
+then commit and push changes to the docker-openldap repository. It will trigger CI/CD to build and upload
 gcr.io/uit-authnz/openldap:latest image.
 
 ## Manual push to Google container registry