diff --git a/src/doc/guide.md b/src/doc/guide.md
index b78272632e89..033e6184d25c 100644
--- a/src/doc/guide.md
+++ b/src/doc/guide.md
@@ -1780,7 +1780,7 @@ Finally, Cargo generated a hello, world for us. Check out `src/main.rs`:
 
 ```{rust}
 fn main() {
-    println!("Hello world!");
+    println!("Hello, world!");
 }
 ```