diff --git a/seed/challenges/01-responsive-web-design/css-flexbox.json b/seed/challenges/01-responsive-web-design/css-flexbox.json
index ebc35bdaba3..5af6cbfcc9f 100644
--- a/seed/challenges/01-responsive-web-design/css-flexbox.json
+++ b/seed/challenges/01-responsive-web-design/css-flexbox.json
@@ -1028,7 +1028,7 @@
         "The default property settings are <code>flex: 0 1 auto;</code>.",
         "<hr>",
         "Add the CSS property <code>flex</code> to both <code>#box-1</code> and <code>#box-2</code>. Give <code>#box-1</code> the values so its <code>flex-grow</code> is 2, its <code>flex-shrink</code> is 2, and its <code>flex-basis</code> is 150px. Give <code>#box-2</code> the values so its <code>flex-grow</code> is 1, its <code>flex-shrink</code> is 1, and its <code>flex-basis</code> is 150px.",
-        "These values will cause <code>#box-1</code> to be twice the size of <code>#box-2</code> when the container is greater than 300px and half the size of #box-2 when the container is less than 300px. 300px is the combined size of the <code>flex-basis</code> values of the two boxes."
+        "These values will cause <code>#box-1</code> to grow to fill the extra space at twice the rate of <code>#box-2</code> when the container is greater than 300px and shrink at twice the rate of <code>#box-2</code> when the container is less than 300px. 300px is the combined size of the <code>flex-basis</code> values of the two boxes."
       ],
       "challengeSeed": [
         "<style>",