Make it explicit that the keyword in pod finder is optional

app/templates/pod_finder/index.html

@@ -52,7 +52,7 @@
             <p>Looking for pods that may interest you? Enter some keywords below and your pear will try to find appropriate pods for you, from 'official' online pods.</p><br>
             <form class="form-inline" accept-charset="UTF-8" enctype="multipart/form-data" action="{{url_for('pod_finder.find_a_pod')}}">
                 <div class="input-group">
-                     <input class="form-control input-s" title="Enter some keywords" placeholder="Enter some keywords" type="text" name="search-pod" id="search-pod">
+                     <input class="form-control input-s" title="Enter some keywords" placeholder="Enter some keywords (optional)" type="text" name="search-pod" id="search-pod">
                      <span class="input-group-btn">
                      <input id="submit_button" type="submit" class="btn btn-primary" value="Find a pod" style="width:100px !important">
                      </span>