diff --git a/externs/olx.js b/externs/olx.js
index 6d40972245..dfa70d816f 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -5076,7 +5076,7 @@ olx.source.XYZOptions.prototype.wrapX;
  *     url: !string,
  *     tierSizeCalculation: (string|undefined),
  *     size: ol.Size}}
- * @api
+ * @api stable
  */
 olx.source.ZoomifyOptions;
 
diff --git a/src/ol/source/zoomifysource.js b/src/ol/source/zoomifysource.js
index dec0f4fcc9..7c7bd3dd79 100644
--- a/src/ol/source/zoomifysource.js
+++ b/src/ol/source/zoomifysource.js
@@ -29,7 +29,7 @@ ol.source.ZoomifyTierSizeCalculation = {
  * @constructor
  * @extends {ol.source.TileImage}
  * @param {olx.source.ZoomifyOptions=} opt_options Options.
- * @api
+ * @api stable
  */
 ol.source.Zoomify = function(opt_options) {