diff --git a/subjects/rot21/README.md b/subjects/rot21/README.md
index cef47cee..aa20978f 100644
--- a/subjects/rot21/README.md
+++ b/subjects/rot21/README.md
@@ -35,6 +35,7 @@ fn main() {
 And its output
 
 ```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
 The letter "a" becomes: v
 The letter "m" becomes: h
 The word "MISS" becomes: HDNN