diff --git a/tools/docker-compose/README.md b/tools/docker-compose/README.md
index 88476003fc..5f13612120 100644
--- a/tools/docker-compose/README.md
+++ b/tools/docker-compose/README.md
@@ -37,6 +37,7 @@ Notable files:
   - This also installs the `docker` Python module, which is incompatible with [`docker-py`](https://pypi.org/project/docker-py/). If you have previously installed `docker-py`, please uninstall it.
 - [Docker Compose](https://docs.docker.com/compose/install/).
 - [Ansible](https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html) will need to be installed as we use it to template files needed for the docker-compose.
+- OpenSSL.
 
 ### Tested Operating Systems