diff --git a/book/src/04_traits/12_copy.md b/book/src/04_traits/12_copy.md
index f51778ec5d..c4140f1b1b 100644
--- a/book/src/04_traits/12_copy.md
+++ b/book/src/04_traits/12_copy.md
@@ -108,6 +108,7 @@ You can just derive it, like this:
 ```rust
 #[derive(Copy, Clone)]
 struct MyStruct {
-    field: u32,
+    field_1: u32,
+    field_2: u32,
 }
 ```