Make the textbox less ambiguous

Author: Michael Vartan

index.html

@@ -47,7 +47,7 @@ <h1>
   </header>
   <div id="expr-wrapper">
     <div id="expr-caret">&gt;</div>
-    <input id="expr" autocomplete="off" type="text" autofocus="autofocus">
+    <input id="expr" autocomplete="off" type="text" autofocus="autofocus" placeholder="Type your solution here">
   </div>
 
   <ol id="rules">
@@ -65,4 +65,4 @@ <h1>
   <script src="js/main.js"></script>
 </body>
 
-</html>
+</html>