diff --git a/eth2/utils/tree_hash/README.md b/eth2/utils/tree_hash/README.md
index 55b6cea376..0498bfc3ee 100644
--- a/eth2/utils/tree_hash/README.md
+++ b/eth2/utils/tree_hash/README.md
@@ -57,7 +57,7 @@ fn main() {
 			Foo {
 				a: 100,
 				b: vec![1, 2, 3, 4, 5, 6]
-			}
+			},
 			Foo {
 				a: 42,
 				b: vec![]