diff --git a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
index 8a993bb73..083910b1b 100644
--- a/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/defaults/main.yml
@@ -5,6 +5,11 @@ matrix_mx_puppet_slack_enabled: true
 
 matrix_mx_puppet_slack_container_image_self_build: false
 
+# Controls whether the mx-puppet-slack container exposes its HTTP port (tcp/8432 in the container).
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:8432"), or empty string to not expose.
+matrix_mx_puppet_slack_container_http_host_bind_port: ''
+
 matrix_mx_puppet_slack_docker_image: "sorunome/mx-puppet-slack:latest"
 matrix_mx_puppet_slack_docker_image_force_pull: "{{ matrix_mx_puppet_slack_docker_image.endswith(':latest') }}"
 
diff --git a/roles/matrix-bridge-mx-puppet-slack/tasks/init.yml b/roles/matrix-bridge-mx-puppet-slack/tasks/init.yml
index 5781adf5e..dac04b9bf 100644
--- a/roles/matrix-bridge-mx-puppet-slack/tasks/init.yml
+++ b/roles/matrix-bridge-mx-puppet-slack/tasks/init.yml
@@ -57,8 +57,8 @@
     msg: >-
       NOTE: You've enabled the Matrix Slack bridge but are not using the matrix-nginx-proxy
       reverse proxy.
-      Please make sure that you're proxying the `{{ something }}`
-      URL endpoint to the matrix-appservice-slack container.
+      Please make sure that you're proxying the `{{ matrix_mx_puppet_slack_redirect_path }}`
+      URL endpoint to the matrix-mx-puppet-slack container.
       You can expose the container's port using the `matrix_appservice_slack_container_http_host_bind_port` variable.
   when: "matrix_mx_puppet_slack_enabled|bool and matrix_nginx_proxy_enabled is not defined"
 
diff --git a/roles/matrix-bridge-mx-puppet-slack/templates/systemd/matrix-mx-puppet-slack.service.j2 b/roles/matrix-bridge-mx-puppet-slack/templates/systemd/matrix-mx-puppet-slack.service.j2
index a86c6765d..6db537336 100644
--- a/roles/matrix-bridge-mx-puppet-slack/templates/systemd/matrix-mx-puppet-slack.service.j2
+++ b/roles/matrix-bridge-mx-puppet-slack/templates/systemd/matrix-mx-puppet-slack.service.j2
@@ -22,6 +22,9 @@ ExecStart=/usr/bin/docker run --rm --name matrix-mx-puppet-slack \
 			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
 			--cap-drop=ALL \
 			--network={{ matrix_docker_network }} \
+			{% if matrix_mx_puppet_slack_container_http_host_bind_port %}
+			-p {{ matrix_mx_puppet_slack_container_http_host_bind_port }}:{{ matrix_mx_puppet_slack_appservice_port }} \
+			{% endif %}
 			-e CONFIG_PATH=/config/config.yaml \
 			-e REGISTRATION_PATH=/config/registration.yaml \
 			-v {{ matrix_mx_puppet_slack_config_path }}:/config:z \