diff --git a/externs/olx.js b/externs/olx.js
index d4ab3c760e..bfab788438 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -4181,7 +4181,7 @@ olx.source.ImageVectorOptions.prototype.style;
  *     ratio: (number|undefined),
  *     resolutions: (Array.<number>|undefined),
  *     url: (string|undefined)}}
- * @api
+ * @api stable
  */
 olx.source.ImageWMSOptions;
 
diff --git a/src/ol/source/imagewmssource.js b/src/ol/source/imagewmssource.js
index b5bf1f9695..916c5e3189 100644
--- a/src/ol/source/imagewmssource.js
+++ b/src/ol/source/imagewmssource.js
@@ -23,7 +23,7 @@ goog.require('ol.source.wms.ServerType');
  * @constructor
  * @extends {ol.source.Image}
  * @param {olx.source.ImageWMSOptions=} opt_options Options.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS = function(opt_options) {
 
@@ -123,7 +123,7 @@ ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_ = [101, 101];
  *     in the `LAYERS` parameter will be used. `VERSION` should not be
  *     specified here.
  * @return {string|undefined} GetFeatureInfo URL.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
     function(coordinate, resolution, projection, params) {
@@ -163,7 +163,7 @@ ol.source.ImageWMS.prototype.getGetFeatureInfoUrl =
  * Get the user-provided params, i.e. those passed to the constructor through
  * the "params" option, and possibly updated using the updateParams method.
  * @return {Object} Params.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS.prototype.getParams = function() {
   return this.params_;
@@ -304,7 +304,7 @@ ol.source.ImageWMS.prototype.getRequestUrl_ =
 /**
  * Return the URL used for this WMS source.
  * @return {string|undefined} URL.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS.prototype.getUrl = function() {
   return this.url_;
@@ -313,7 +313,7 @@ ol.source.ImageWMS.prototype.getUrl = function() {
 
 /**
  * @param {string|undefined} url URL.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS.prototype.setUrl = function(url) {
   if (url != this.url_) {
@@ -327,7 +327,7 @@ ol.source.ImageWMS.prototype.setUrl = function(url) {
 /**
  * Update the user-provided params.
  * @param {Object} params Params.
- * @api
+ * @api stable
  */
 ol.source.ImageWMS.prototype.updateParams = function(params) {
   goog.object.extend(this.params_, params);