diff --git a/src/ol/format/osmxmlformat.js b/src/ol/format/osmxmlformat.js
index 987401104e..888b1daf52 100644
--- a/src/ol/format/osmxmlformat.js
+++ b/src/ol/format/osmxmlformat.js
@@ -180,6 +180,17 @@ ol.format.OSMXML.NODE_PARSERS_ = ol.xml.makeParsersNS(
     });
 
 
+/**
+ * Read all features from an OSM source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ * @todo api
+ */
+ol.format.OSMXML.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */