diff --git a/src/ol/format/gmlformat.js b/src/ol/format/gmlformat.js
index 1dd843cb23..089c38ed32 100644
--- a/src/ol/format/gmlformat.js
+++ b/src/ol/format/gmlformat.js
@@ -26,6 +26,7 @@ goog.require('ol.xml');
 /**
  * @classdesc
  * Feature format for reading and writing data in the GML format.
+ * Currently only supports GML 3.1.1 Simple Features profile.
  *
  * @constructor
  * @param {olx.format.GMLOptions=} opt_options
diff --git a/src/ol/format/wfsformat.js b/src/ol/format/wfsformat.js
index 76fa7c6c86..8d8f7327b7 100644
--- a/src/ol/format/wfsformat.js
+++ b/src/ol/format/wfsformat.js
@@ -15,6 +15,8 @@ goog.require('ol.xml');
 /**
  * @classdesc
  * Feature format for reading and writing data in the WFS format.
+ * Currently only supports WFS version 1.1.0.
+ * Also see {@link ol.format.GML} which is used by this format.
  *
  * @constructor
  * @param {olx.format.WFSOptions=} opt_options