diff --git a/custom_zulip_files/README.custom_zulip_files.md b/custom_zulip_files/README.custom_zulip_files.md
new file mode 100644
index 0000000..07d1d45
--- /dev/null
+++ b/custom_zulip_files/README.custom_zulip_files.md
@@ -0,0 +1,10 @@
+The custom_zulip_files mechanism allows you to test edits to Zulip
+before making changes in the upstream repo.  It works by copying the
+contents of this directory on top of the main zulip/zulip checkout as
+part of the Docker build process.
+
+As an example, if you want to test a change to
+`scripts/setup/generate-self-signed-cert`, you would grab a copy of
+the script from zulip/zulip, place it at
+`custom_zulip_files/scripts/setup/generate-self-signed-cert`, make
+your local edits, and then run `docker-compose build`.
diff --git a/custom_zulip_files/scripts/setup/configure-rabbitmq b/custom_zulip_files/scripts/setup/configure-rabbitmq
deleted file mode 100755
index a6ed61c..0000000
--- a/custom_zulip_files/scripts/setup/configure-rabbitmq
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/usr/bin/env bash
-#
-# Delete the "guest" default user and replace it with a Zulip user
-# with a real password
-set -e
-set -x
-
-RABBITMQ_HOST=$("$(dirname "$0")/../get-django-setting" RABBITMQ_HOST)
-RABBITMQ_USERNAME=$("$(dirname "$0")/../get-django-setting" RABBITMQ_USERNAME)
-RABBITMQ_PASSWORD=$("$(dirname "$0")/../get-django-setting" RABBITMQ_PASSWORD)
-sudo rabbitmqctl -n "$RABBITMQ_HOST" delete_user "$RABBITMQ_USERNAME" || true
-sudo rabbitmqctl -n "$RABBITMQ_HOST" delete_user zulip || true
-sudo rabbitmqctl -n "$RABBITMQ_HOST" delete_user guest || true
-sudo rabbitmqctl -n "$RABBITMQ_HOST" add_user "$RABBITMQ_USERNAME" "$RABBITMQ_PASSWORD"
-sudo rabbitmqctl -n "$RABBITMQ_HOST" set_user_tags "$RABBITMQ_USERNAME" administrator
-sudo rabbitmqctl -n "$RABBITMQ_HOST" set_permissions -p / "$RABBITMQ_USERNAME" '.*' '.*' '.*'