diff --git a/src/doc/trpl/functions.md b/src/doc/trpl/functions.md
index e212af5194b8..ca1385fde9c7 100644
--- a/src/doc/trpl/functions.md
+++ b/src/doc/trpl/functions.md
@@ -60,7 +60,7 @@ not work:
 
 ```{rust,ignore}
 fn print_sum(x, y) {
-    println!("x is: {}", x + y);
+    println!("sum is: {}", x + y);
 }
 ```