diff --git a/doc/developer.md b/doc/developer.md
index f0008d9..7824e17 100644
--- a/doc/developer.md
+++ b/doc/developer.md
@@ -43,6 +43,8 @@ if (reply.isEmpty())) {
 }
 ```
 
+Yes, `isEmpty()` is not a very strict check, we could actually check for valid-looking JSON (starts with a { and ends with a }) as well as making sure the keys "seed" and "birthday" exist. Please implement this.
+
 When checking the return value of `litelib_initialize_new`  it should look like :
 
 ```