diff --git a/2-ui/1-document/07-modifying-document/10-clock-setinterval/solution.view/index.html b/2-ui/1-document/07-modifying-document/10-clock-setinterval/solution.view/index.html
index 5c0319b6..1bf642b1 100644
--- a/2-ui/1-document/07-modifying-document/10-clock-setinterval/solution.view/index.html
+++ b/2-ui/1-document/07-modifying-document/10-clock-setinterval/solution.view/index.html
@@ -54,5 +54,11 @@
     clockStart();
   </script>
 
+  <!-- click on this button calls clockStart() -->
+  <input type="button" onclick="clockStart()" value="Start">
+
+  <!-- click on this button calls clockStop() -->
+  <input type="button" onclick="clockStop()" value="Stop">
+
 </body>
 </html>
diff --git a/2-ui/1-document/07-modifying-document/10-clock-setinterval/task.md b/2-ui/1-document/07-modifying-document/10-clock-setinterval/task.md
index ba6e3a84..70bc2ae9 100644
--- a/2-ui/1-document/07-modifying-document/10-clock-setinterval/task.md
+++ b/2-ui/1-document/07-modifying-document/10-clock-setinterval/task.md
@@ -7,3 +7,5 @@ importance: 4
 Create a colored clock like here:
 
 [iframe src="solution" height=60]
+
+Use HTML/CSS for the styling, Javascript only updates time in elements.