diff --git a/README.md b/README.md
index a1ad122..769289b 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # KOreader Sync Server
-This is a KOreader sync server, implemented in Rust.
+This is a KOreader sync server, implemented in Rust. It uses the crates *axum*, *redis*, *serde* and *serde_json*.
+
+## Requirements
+- Rust toolchain (≥ 1.63) for compilation
+- A running Redis server
+- Nginx (or Apache) webserver as a reverse proxy, since kosyncrs only listens locally and uses HTTP.
 
 ## Installation
 Just compile it with `cargo build --release`. You can then copy the executable for example to `/usr/local/bin/`. If you want to start the service automatically, you can adopt the example systemd file for your needs. You can also use nginx as a reverse proxy, so that the sync server listens on port 443.