diff --git a/exercises/allergies/description.md b/exercises/allergies/description.md
index 2b9ca8e031..ce6b0c5af5 100644
--- a/exercises/allergies/description.md
+++ b/exercises/allergies/description.md
@@ -19,3 +19,9 @@ Now, given just that score of 34, your program should be able to say:
 
 - Whether Tom is allergic to any one of those allergens listed above.
 - All the allergens Tom is allergic to.
+
+Note: a given score may include allergens **not** listed above (i.e.
+allergens that score 256, 512, 1024, etc.).  Your program should
+ignore those components of the score.  For example, if the allergy
+score is 257, your program should only report the eggs (1) allergy.
+