diff --git a/lib/OpenLayers/Format/SOSGetObservation.js b/lib/OpenLayers/Format/SOSGetObservation.js
index af9ed339b9..2127015111 100644
--- a/lib/OpenLayers/Format/SOSGetObservation.js
+++ b/lib/OpenLayers/Format/SOSGetObservation.js
@@ -4,6 +4,8 @@
 
 /**
  * @requires OpenLayers/Format/XML.js
+ * @requires OpenLayers/Format/GML.js
+ * @requires OpenLayers/Format/GML/v3.js
  */
 
 /**