diff --git a/src/websrc/myesp.htm b/src/websrc/myesp.htm
index ab91c9606..51d92dc2f 100644
--- a/src/websrc/myesp.htm
+++ b/src/websrc/myesp.htm
@@ -215,7 +215,7 @@
     <div class="row form-group">
         <label class="col-xs-3">Base<i style="margin-left: 10px;" class="glyphicon glyphicon-info-sign"
                 aria-hidden="true" data-toggle="popover" data-trigger="hover" data-placement="right"
-                data-content="MQTT base prefix (optional)"></i></label>
+                data-content="MQTT topic prefix (&lt;mqtt base&gt;/&lt;host name&gt;/)"></i></label>
         <span class="col-xs-9">
             <input class="form-control input-sm" placeholder="MQTT base" value="" style="display:inline;max-width:185px"
                 id="mqttbase" type="text">