diff --git a/libraries/gis/GISVisualization.php b/libraries/gis/GISVisualization.php
index f8fdaa2da3..2879bb65cd 100644
--- a/libraries/gis/GISVisualization.php
+++ b/libraries/gis/GISVisualization.php
@@ -411,6 +411,8 @@ class GISVisualization
     /**
      * Get the code for visualization with OpenLayers.
      *
+     * @todo Should return JSON to avoid eval() in gis_data_editor.js
+     *
      * @return string the code for visualization with OpenLayers
      * @access public
      */