tracks/python/exercises/collatz-conjecture/.meta/hints.md in trackler-2.2.1.74 vs tracks/python/exercises/collatz-conjecture/.meta/hints.md in trackler-2.2.1.75

@@ -1,3 +1,3 @@
 ## Notes
 
-The Collatz Conjecture is only concerned with strictly positive integers, so your solution should return `None` if given 0 or a negative integer.
+The Collatz Conjecture is only concerned with strictly positive integers, so your solution should raise a `ValueError` with a meaningful message if given 0 or a negative integer.