diff --git a/src/ol/format/gmlformat.js b/src/ol/format/gmlformat.js
index df9e1b8b78..1dd843cb23 100644
--- a/src/ol/format/gmlformat.js
+++ b/src/ol/format/gmlformat.js
@@ -1689,7 +1689,7 @@ ol.format.GML.prototype.writeGeometryNode = function(geometry) {
  *
  * @function
  * @param {Array.<ol.Feature>} features Features.
- * @return {ArrayBuffer|Node|Object|string} Result.
+ * @return {Node} Result.
  * @api
  */
 ol.format.GML.prototype.writeFeatures;
diff --git a/src/ol/format/gpxformat.js b/src/ol/format/gpxformat.js
index 1e1b9f5d07..af48c40316 100644
--- a/src/ol/format/gpxformat.js
+++ b/src/ol/format/gpxformat.js
@@ -845,7 +845,7 @@ ol.format.GPX.GPX_SERIALIZERS_ = ol.xml.makeStructureNS(
  *
  * @function
  * @param {Array.<ol.Feature>} features Features.
- * @return {ArrayBuffer|Node|Object|string} Result.
+ * @return {Node} Result.
  * @api
  */
 ol.format.GPX.prototype.writeFeatures;
diff --git a/src/ol/format/kmlformat.js b/src/ol/format/kmlformat.js
index f598188fc5..20f0fef1c6 100644
--- a/src/ol/format/kmlformat.js
+++ b/src/ol/format/kmlformat.js
@@ -2494,7 +2494,7 @@ ol.format.KML.OUTER_BOUNDARY_NODE_FACTORY_ =
  *
  * @function
  * @param {Array.<ol.Feature>} features Features.
- * @return {ArrayBuffer|Node|Object|string} Result.
+ * @return {Node} Result.
  * @api
  */
 ol.format.KML.prototype.writeFeatures;