diff --git a/typescript.md b/typescript.md
index e3b24ceb..b72bd4cd 100644
--- a/typescript.md
+++ b/typescript.md
@@ -271,7 +271,7 @@ for (const i of list) {
 // for..in statement
 // iterate over the list of keys on the object being iterated
 for (const i in list) {
-   console.log(i); // 0, 1, 2
+   console.log(i); // "0", "1", "2"
 }
 
 // Type Assertion