diff --git a/exercises/sum-of-multiples/description.md b/exercises/sum-of-multiples/description.md
index 735cd579c9..3499c4c937 100644
--- a/exercises/sum-of-multiples/description.md
+++ b/exercises/sum-of-multiples/description.md
@@ -3,5 +3,5 @@ multiples of either 3 or 5, we get 3, 5, 6 and 9, 10, 12, 15, and 18.
 
 The sum of these multiples is 78.
 
-Write a program that can find the sum of the multiples of a given set of
-numbers.
+Write a program that, given a number, can find the sum of the multiples
+of a given set of numbers, up to but not including that number.