diff --git a/ch5/ch5-07.md b/ch5/ch5-07.md
index 8c5e2db..7ce3bff 100644
--- a/ch5/ch5-07.md
+++ b/ch5/ch5-07.md
@@ -6,7 +6,7 @@
 
 <u><i>gopl.io/ch5/sum</i></u>
 ```Go
-func sum(vals...int) int {
+func sum(vals ...int) int {
 	total := 0
 	for _, val := range vals {
 		total += val