diff --git a/README.md b/README.md
index 4ae66cec4..da5e9e33f 100644
--- a/README.md
+++ b/README.md
@@ -61,14 +61,12 @@ export PATH=${PATH}:/Applications/Postgres.app/Contents/Versions/11/bin/
 
 ### Redis
 
-To switch redis on you'll need to install it locally. On a OSX we've used brew for this. To use redis caching you need to switch it on by changing the config for development:
+To switch redis on you'll need to install it locally e.g. `brew install redis`. To use redis caching you need to switch it on with an environment variable:
 
 ```
-REDIS_ENABLED = 1
+export REDIS_ENABLED=1
 ```
 
-Note that if you're running Celery with Docker locally, then you'll also need to set `REDIS_URL=redis://host.docker.internal:6379`.
-
 ##  To run the application
 
 ```
diff --git a/scripts/run_with_docker.sh b/scripts/run_with_docker.sh
index b53d729e4..70933d111 100755
--- a/scripts/run_with_docker.sh
+++ b/scripts/run_with_docker.sh
@@ -9,13 +9,14 @@ source environment.sh
 AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID:-"$(aws configure get aws_access_key_id)"}
 AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY:-"$(aws configure get aws_secret_access_key)"}
 : "${SQLALCHEMY_DATABASE_URI:=postgresql://postgres@host.docker.internal/notification_api}"
+REDIS_URL="redis://host.docker.internal:6379"
 
 docker run -it --rm \
   -e AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID \
   -e AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY \
   -e SQLALCHEMY_DATABASE_URI=$SQLALCHEMY_DATABASE_URI \
   -e REDIS_ENABLED=${REDIS_ENABLED:-0} \
-  -e REDIS_URL=${REDIS_URL:-''} \
+  -e REDIS_URL=$REDIS_URL \
   -v $(pwd):/home/vcap/app \
   ${DOCKER_IMAGE_NAME} \
   ${@}