diff --git a/code/01_starter/hello_app/src/main.rs b/code/01_starter/hello_app/src/main.rs
index f893ed7..bf309b9 100644
--- a/code/01_starter/hello_app/src/main.rs
+++ b/code/01_starter/hello_app/src/main.rs
@@ -16,7 +16,7 @@ fn main() {
 
 // simple function
 fn simple_func() {
-    println!("Hello Rust programming");
+    println!("Hello Rust programming!");
     println!("Rust programming is an awesome language");
 }