diff --git a/curriculum/challenges/english/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md b/curriculum/challenges/english/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
index 3e27c394639..db3026fc64a 100644
--- a/curriculum/challenges/english/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
+++ b/curriculum/challenges/english/05-back-end-development-and-apis/back-end-development-and-apis-projects/timestamp-microservice.md
@@ -30,7 +30,7 @@ You should provide your own project, not the example URL.
 };
 ```
 
-A request to `/api/:date?` with a valid date should return a JSON object with a `unix` key that is a Unix timestamp of the input date in milliseconds
+A request to `/api/:date?` with a valid date should return a JSON object with a `unix` key that is a Unix timestamp of the input date in milliseconds (as type Number)
 
 ```js
 (getUserInput) =>