diff --git a/src/5_pin.md b/src/5_pin.md
index 8a6e23d..54e6b44 100644
--- a/src/5_pin.md
+++ b/src/5_pin.md
@@ -527,8 +527,8 @@ pub fn main() {
     let mut test1 = Test::new("test1");
     let mut test2 = Test::new("test2");
 
-    println!("a: {}, b: {}",test1.as_ref().a(), test1.as_ref().b());
-    println!("a: {}, b: {}",test2.as_ref().a(), test2.as_ref().b());
+    println!("a: {}, b: {}", test1.as_ref().a(), test1.as_ref().b());
+    println!("a: {}, b: {}", test2.as_ref().a(), test2.as_ref().b());
 }
 ```