diff --git a/other/whats-a-test/3.todo.js b/other/whats-a-test/3.todo.js
index c14627c9..29a65ef5 100644
--- a/other/whats-a-test/3.todo.js
+++ b/other/whats-a-test/3.todo.js
@@ -12,6 +12,13 @@ Then wrap each of your tests in a `test` function.
 This also means that we can run all the tests even
 if one of them fails!
 
+Example of test function
+test(title, () => {
+  // arrange
+  // act
+  // assert
+}
+
 Then run this code with `node 3.todo`
 
 > Make sure you're in the right directory!