diff --git a/seed/challenges/basic-html5-and-css.json b/seed/challenges/basic-html5-and-css.json
index bc93160d7b..8c81f5000d 100644
--- a/seed/challenges/basic-html5-and-css.json
+++ b/seed/challenges/basic-html5-and-css.json
@@ -2554,7 +2554,7 @@
       "dashedName": "waypoint-add-a-negative-margin-to-an-element",
       "difficulty": 0.042,
       "description": [
-        "Change the <code>margin</code> of the green box to a negative value, so it fills the entire horizontal width of the yellow box around it.",
+        "Change the <code>margin</code> of the green box to -15 pixels, so it fills the entire horizontal width of the yellow box around it.",
         "An element's <code>margin</code> controls the amount of space between an element's <code>border</code> and surrounding elements.",
         "If you set an element's <code>margin</code> to a negative value, the element will grow larger.",
         "Try to set the <code>margin</code> to a negative value like the one for the red box."