diff --git a/README.md b/README.md
index 946f16f67e16d2e4badf575710a5fc46f4839c01..445a1270a0e260683b92be205291bf26d8a66ddc 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@ Author: Florian Burgener
 
 ## Prerequisites
 
+* The Rust toolchain, see <https://www.rust-lang.org/>
 * OpenSSL (`apt install libssl-dev` on Ubuntu)
 
 ## Installation