diff --git a/4.0.0-alpha.2/Dockerfile b/4.0.0-alpha.2/Dockerfile
index be23aa9..2b76c74 100644
--- a/4.0.0-alpha.2/Dockerfile
+++ b/4.0.0-alpha.2/Dockerfile
@@ -1,8 +1,8 @@
 FROM jetty:9-jre8
 
-ENV GN_FILE geonetwork.war
+ENV GN_FILE GeoNetwork-4.0.0-alpha.2.war
 ENV GN_VERSION 4.0.0-alpha.2
-ENV GN_DOWNLOAD_MD5 TODO
+ENV GN_DOWNLOAD_MD5 f6090659f67b313637760882e256c23b
 
 USER root
 RUN apt-get -y update && \
@@ -15,12 +15,12 @@ RUN apt-get -y update && \
 
 USER jetty
 RUN cd /var/lib/jetty/webapps/geonetwork/ && \
-    curl -fSL -o $GN_FILE \
-     https://sourceforge.net/projects/geonetwork/files/GeoNetwork_unstable_development_versions/${GN_VERSION}/geonetwork.war/download && \
-     echo "$GN_DOWNLOAD_MD5 *${GN_FILE}" | md5sum -c \
+    curl -fSL -o geonetwork.war \
+     https://sourceforge.net/projects/geonetwork/files/GeoNetwork_unstable_development_versions/${GN_VERSION}/$GN_FILE/download && \
+     echo "$GN_DOWNLOAD_MD5 *geonetwork.war" | md5sum -c && \
      unzip geonetwork.war && \
      rm geonetwork.war
 
 COPY ./docker-entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
-CMD [ "jetty.start" ]
+CMD ["jetty.start"]
diff --git a/4.0.0-alpha.2/Dockerfile.local b/4.0.0-alpha.2/Dockerfile.local
index f4a4292..b36bb28 100644
--- a/4.0.0-alpha.2/Dockerfile.local
+++ b/4.0.0-alpha.2/Dockerfile.local
@@ -18,4 +18,4 @@ RUN  cd /var/lib/jetty/webapps/geonetwork/ && \
 
 COPY ./docker-entrypoint.sh /entrypoint.sh
 ENTRYPOINT ["/entrypoint.sh"]
-CMD [ "jetty.start" ]
\ No newline at end of file
+CMD ["jetty.start"]
\ No newline at end of file
diff --git a/4.0.0-alpha.2/README.md b/4.0.0-alpha.2/README.md
index 233caf1..1aa46d2 100644
--- a/4.0.0-alpha.2/README.md
+++ b/4.0.0-alpha.2/README.md
@@ -4,25 +4,32 @@
 
 1. Clone this repository
 
-```shell
+```shell script
 git clone https://github.com/geonetwork/docker-geonetwork.git
 cd docker-geonetwork/4.0.0-alpha.2
 ```
 
 2. Run the docker-composition from the current directory:
 
-```shell
+```shell script
 docker-compose up
 ```
 
 3. Open http://localhost:8080/geonetwork/ in a browser
 
 
+## Build docker image
+
+If not published, you can build the image locally using:
+
+```shell script
+docker build .
+```
 
 ## Running with remote Elasticsearch
 
 
-```shell
+```shell script
 docker run -p 8080:8080 \
 -e "GEONETWORK_DB_NAME=/tmp/gndb" \
 -e "ES_HOST=my-elasticsearch-host" \
@@ -45,7 +52,7 @@ discovery.seed_hosts: []
 
 
 This directory includes two Dockerfiles:
-* `Dockerfile` is cannonical one used to generate the Docker Hub official 
+* `Dockerfile` is canonical one used to generate the Docker Hub official 
 image. It downloads GeoNetwork 4.0.0-alpha.2 WAR file from sourceforge.  
 * `Dockerfile.local` needs a `geonetwork.war` file next to it to build
 the image.
@@ -61,7 +68,7 @@ It also includes two docker-compose configuration files.
 To use the pre-built image you can use the `docker-compose.yml` file provided 
 in this directory:
 
-```shell
+```shell script
 docker-compose up 
 ```
 
@@ -73,7 +80,7 @@ To be able to generate an elasticsearch-ready docker image, you will have:
 
 2. Clone this repository
 
-```shell
+```shell script
 git clone https://github.com/geonetwork/docker-geonetwork.git
 cd docker-geonetwork/4.0.0-alpha.2
 ```
@@ -86,7 +93,7 @@ cp ../../core-geonetwork/web/target/geonetwork.war .
 
 4. Run the docker-composition from the current directory:
 
-```shell
+```shell script
 docker-compose -f docker-compose.yml -f docker-compose.dev.yml up --build
 ```
 
@@ -97,7 +104,7 @@ docker-compose -f docker-compose.yml -f docker-compose.dev.yml up --build
 See "Connecting to a postgres database" https://hub.docker.com/_/geonetwork
 
 
-```shell
+```shell script
 docker run --name geonetwork -d -p 8080:8080 \
 -e GEONETWORK_DB_TYPE=postgres \
 -e GEONETWORK_DB_HOST=my-db-host \