diff --git a/docs/services/semaphore.md b/docs/services/semaphore.md
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+# Semaphore
+
+[Semaphore](https://www.ansible-semaphore.com/) is a responsive web UI for running Ansible playbooks. Installing it is powered by the [mother-of-all-self-hosting/ansible-role-semaphore](https://github.com/mother-of-all-self-hosting/ansible-role-semaphore) Ansible role.
+
+## Dependencies
+
+This service requires the following other services:
+
+- a [Postgres](postgres.md) database
+- a [Traefik](traefik.md) reverse-proxy server
+
+
+## Configuration
+
+To enable this service, add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:
+
+```yaml
+########################################################################
+#                                                                      #
+# semaphore                                                            #
+#                                                                      #
+########################################################################
+
+semaphore_enabled: true
+semaphore_hostname: semaphore.example.com
+semaphore_admin_password: STRONG_PASSWORD
+semaphore_admin_name: USERNAME
+semaphore_admin_email: user@example.org
+# Key for encrypting access keys in database.
+# It must be generated by using the following command: head -c32 /dev/urandom | base64
+semaphore_access_key_encryption: "PJOfV/7Q+ZDUxo2bgW8dgVbGJ6nNIJgEOyB3hcnVVz4="
+
+########################################################################
+#                                                                      #
+# /semaphore                                                           #
+#                                                                      #
+########################################################################
+```
+
+
+## Usage
+
+After [installing](../installing.md), you can log into you admin account by visiting the URL specified in `semaphore_hostname`.
diff --git a/docs/supported-services.md b/docs/supported-services.md
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--- a/docs/supported-services.md
+++ b/docs/supported-services.md
@@ -59,6 +59,7 @@
 | [Redis](https://redis.io/) | An in-memory data store used by millions of developers as a database, cache, streaming engine, and message broker. | [Link](services/redis.md) |
 | [Roundcube](https://roundcube.net/) | A browser-based multilingual IMAP client with an application-like user interface | [Link](services/roundcube.md) |
 | [rumqttd](https://github.com/bytebeamio/rumqtt) | A high performance, embeddable [MQTT](https://en.wikipedia.org/wiki/MQTT) broker | [Link](services/rumqttd.md) |
+| [Ansible Semaphore](https://www.ansible-semaphore.com/) | A responsive web UI for running Ansible playbooks  | [Link](services/semaphore.md) |
 | [Soft Serve](https://github.com/charmbracelet/soft-serve) | A tasty, self-hostable [Git](https://git-scm.com/) server for the command line | [Link](services/soft-serve.md) |
 | [Syncthing](https://syncthing.net/) | A continuous file synchronization program which synchronizes files between two or more computers in real time | [Link](services/syncthing.md) |
 | [Telegraf](https://www.influxdata.com/time-series-platform/telegraf/) | An open source server agent to help you collect metrics from your stacks, sensors, and systems. | [Link](services/telegraf.md) |