diff --git a/src/ol/source/wmtssource.js b/src/ol/source/wmtssource.js
index d4943717ad..08ddff7e4c 100644
--- a/src/ol/source/wmtssource.js
+++ b/src/ol/source/wmtssource.js
@@ -313,6 +313,7 @@ ol.source.WMTS.prototype.updateDimensions = function(dimensions) {
 
 
 /**
+ * Generate source options from a capabilities object.
  * @param {Object} wmtsCap An object representing the capabilities document.
  * @param {Object} config Configuration properties for the layer.  Defaults for
  *                  the layer will apply if not provided.