diff --git a/README.md b/README.md
index ca06465d54bc53135f4560d1c755d7cf3d6ec931..b4a43a6f68aad315e23eec9389a25bffcab7fef6 100644
--- a/README.md
+++ b/README.md
@@ -165,7 +165,7 @@ Your code should:
 * Render an `svg` element with the `#renderhere` tag, at least 300px high and wide.
 * The SVG should show the graph of `sin(k * x + t)`. 
   * The value `k` should come from an input box on the page. It is a number, and editing the number should change the chart
-  * The value `t` is the time, taken from `(new Date()).getTime()`
+  * The value `t` is the time, taken from `(new Date()).getTime() / 1000`
 * The chart should update at least 30 times per second. Use the `setInterval()` function for this: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval