diff --git a/Dockerfile b/Dockerfile
index 6d29bb6..af12ff6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,4 @@
-
-FROM lthub/moodle:4.1.0
+FROM lthub/moodle:moodlecore-4.1LTS
 MAINTAINER Tyler Cinkant <tyler.cinkant@ubc.ca>
 
 
@@ -111,16 +110,16 @@ RUN curl -L https://moodle.org/plugins/download.php/26900/mod_questionnaire_mood
     && cp /recomplete.zip /var/www/html/local/ \
     && cd /var/www/html/local \
     && unzip recomplete.zip \
-    && rm recomplete.zip \
+    && rm recomplete.zip 
 
 
 #This is the latest version of this plugin moodle311 - checked again on 11Jan2023 16:38: 
 #ARLO plugin requires Arlo_connection setting.
-    && curl -L https://moodle.org/plugins/download.php/27469/enrol_arlo_moodle311_2022090100.zip -o /enrolarlo.zip \
-    && cp /enrolarlo.zip /var/www/html/enrol/ \
-    && cd /var/www/html/enrol \
-    && unzip enrolarlo.zip \
-    && rm enrolarlo.zip
+#    && curl -L https://moodle.org/plugins/download.php/27469/enrol_arlo_moodle311_2022090100.zip -o /enrolarlo.zip \
+#    && cp /enrolarlo.zip /var/www/html/enrol/ \
+#    && cd /var/www/html/enrol \
+#    && unzip enrolarlo.zip \
+#    && rm enrolarlo.zip
 
 
 # add custom cert
diff --git a/README.md b/README.md
index 7336f48..849db0d 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,56 @@
 <img width="847" alt="MoodleCPD_L2" src="https://github.com/ubc/moodle-docker/assets/86985864/bb61e8a3-866d-4f5e-8a62-1a900e874511">
 
 
+## Build MoodleCPD Image
+
+* Step 3: for development 
+
+* HOW-TO Build MoodleCPD from MoodleCPD 4.1-LTS with Github > Codespace
+* - (optional) fork "moodlecpd-4.1LTS" branch
+  - From "moodlecpd-4.1LTS" branch:
+  - click on the (green button) "<> CODE"
+  - select "Codespaces" tab
+  - click the + to launch Codespaces instance
+    - This will launch a default Codespaces instance with 2-core 8GB RAM, 32GB (sufficient to build this image)
+    - The browser navigates to the codespace instance: something like this... [some random name]gp.github.dev
+    - At bottom, select tab "Terminal" - this is bash shell
+    - Edit Dockerfile or other
+    - After completed the change (if any), then do build image
+
+  - Execute > docker-compose build
+    - After build completed, tag the image. 
+
+  - (optional) docker login -u [your hub.docker.com accout]
+
+  - Execute > docker tag [some image ID] [your hub.docker.com accout]/moodlecpd:4.1.6-[some unique id] 
+    - example, docker tag eb73e7a5c010 hubdocker2020/moodlecpd:4.1.6-eb73e7a5c010
+
+  - Execute > docker push [your hub.docker.com accout]/moodlecpd:4.1.6-[some unique id]
+    - example, docker push hubdocker2020/moodlecpd:4.1.6-eb73e7a5c010
+
+  - DONE with buidling MoodleCPD 4.1 LTS, this image to your hub.docker.com account. 
+
+
+
+* Step 4: for deployment to STAGING or PROD
+
+* After completion of Step 3 above:
+
+  - commit the change back to main repo branch "moodlecpd-4.1LTS" from the Github > Codespaces instance above. 
+
+  - this "commit" step will initiate the automatic building of the image to LTHub, making it ready for the next step 5: HELM launch.
+
+  - DONE with MoodleCPD 4.1 LTS, the Moodle Core image is on LTHub: https://hub.docker.com/u/lthub
+
+
+
+* Step 5: for building MoodleCPD with MoodleCore image from Step 3 OR Step 4 above:
+
+  - To launch with HELM
+
+
+-----------------------
+
 ## Known Issues
 
 * When using NFS shared volume for `/moodledata`, you may get `session data file is not created by your uid` error. It is due to the NFS mount user id mapping is not consistent with local user id. Use Redis session for workaround.