diff --git a/README.md b/README.md
index a735cf8..0c9afc0 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ future. Contributions welcome, but please be kind ;)
 ## Requirements
 
 * Rust
+* Python 3 (needed for building `rust-xcb` dependency)
 * `libasound2-dev` (or `portaudio-dev`, if you want to use the PortAudio backend)
 * `libncurses-dev` and `libssl-dev`
 * `libdbus-1-dev`