diff --git a/rustbyexample/01/src/main.rs b/rustbyexample/01/src/main.rs
index 5a9057a..4d7fa03 100644
--- a/rustbyexample/01/src/main.rs
+++ b/rustbyexample/01/src/main.rs
@@ -20,4 +20,7 @@ fn main() {
     struct Structure(i32);
 
     // println!("This struct `{}` won't print...", Structure(3));
+
+    let pi = 3.141592;
+    println!("Pi is roughly {:.*}", 3, pi);
 }