diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c0bd7e5..cf42a22 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,4 +1,5 @@
 [asdf-vm]: https://asdf-vm.com/
+[auth0-docs]: https://auth0.com/docs/get-started/auth0-overview/create-applications
 
 # 🚀 Getting Started
 
@@ -14,6 +15,12 @@ The following software is required to be installed on your system:
 We recommend using [asdf version manager][asdf-vm] to install and manage all the
 programming languages' requirements.
 
+## 👽 Third-party dependencies
+
+This project uses the [Auth0](https://auth0.com/) for authentication and
+authorization (with a custom javascript script). You need to create an App for
+a SPA to interact with it in development [here][auth0-docs].
+
 ## 🔧 Setup
 
 Install all dependencies.