diff --git a/README.development b/README.development
index 1a14d79d5..ba7addfa5 100644
--- a/README.development
+++ b/README.development
@@ -20,6 +20,7 @@ To start, make sure you have the following installed:
  - rustup (https://rustup.rs/)
  - gettext
  - rename
+ - rsync
 
 The build scripts assume a UNIX-like environment, so on Windows you will
 need to use WSL or Cygwin to use them.