diff --git a/Installation.md b/Installation.md
index 3d239eb..1906b1f 100644
--- a/Installation.md
+++ b/Installation.md
@@ -1,5 +1,9 @@
 # Docker
 
+## Prerequisites for all deployment types
+
+* An IGDB API key. See https://github.com/gaseous-project/gaseous-server/wiki/Metadata for instructions on creating an API key.
+
 ## Deploy with the prebuilt Docker image
 
 Dockerfile and docker-compose.yml files have been provided to make deployment of the server as easy as possible.