diff --git a/README.md b/README.md
index 65382a3..aec7992 100644
--- a/README.md
+++ b/README.md
@@ -83,9 +83,9 @@ Farside also has built-in IP ratelimiting for all requests, enforcing only one
 request per second per IP.
 
 ## Development
-
 - Install [redis](https://redis.io)
 - Install [elixir](https://elixir-lang.org/install.html)
+- (on Debian systems) Install [erlang-dev](https://https://packages.debian.org/sid/erlang-dev)
 - Start redis: `redis-server`
 - Install dependencies: `mix deps.get`
 - Initialize redis contents: `mix run -e Farside.Instances.sync`