diff --git a/externs/olx.js b/externs/olx.js
index 161dbe03da..9729e087dd 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -4807,7 +4807,7 @@ olx.source.StaticVectorOptions.prototype.urls;
  *     maxZoom: (number|undefined),
  *     tileLoadFunction: (ol.TileLoadFunctionType|undefined),
  *     urls: (Array.<string>|undefined)}}
- * @api stable
+ * @api
  */
 olx.source.WMTSOptions;
 
@@ -4815,7 +4815,7 @@ olx.source.WMTSOptions;
 /**
  * Attributions.
  * @type {Array.<ol.Attribution>|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.attributions;
 
@@ -4823,7 +4823,7 @@ olx.source.WMTSOptions.prototype.attributions;
 /**
  * crossOrigin setting for image requests.
  * @type {string|null|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.crossOrigin;
 
@@ -4831,7 +4831,7 @@ olx.source.WMTSOptions.prototype.crossOrigin;
 /**
  * Logo.
  * @type {string|olx.LogoOptions|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.logo;
 
@@ -4839,7 +4839,7 @@ olx.source.WMTSOptions.prototype.logo;
 /**
  * Tile grid.
  * @type {ol.tilegrid.WMTS}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.tileGrid;
 
@@ -4855,7 +4855,7 @@ olx.source.WMTSOptions.prototype.projection;
 /**
  * Request encoding.
  * @type {ol.source.WMTSRequestEncoding|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.requestEncoding;
 
@@ -4863,7 +4863,7 @@ olx.source.WMTSOptions.prototype.requestEncoding;
 /**
  * Layer.
  * @type {string}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.layer;
 
@@ -4871,7 +4871,7 @@ olx.source.WMTSOptions.prototype.layer;
 /**
  * Style.
  * @type {string}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.style;
 
@@ -4890,7 +4890,7 @@ olx.source.WMTSOptions.prototype.tilePixelRatio;
 /**
  * WMTS version. Default is `1.0.0`.
  * @type {string|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.version;
 
@@ -4898,7 +4898,7 @@ olx.source.WMTSOptions.prototype.version;
 /**
  * Image format. Default is `image/jpeg`.
  * @type {string|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.format;
 
@@ -4906,7 +4906,7 @@ olx.source.WMTSOptions.prototype.format;
 /**
  * Matrix set.
  * @type {string}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.matrixSet;
 
@@ -4914,7 +4914,7 @@ olx.source.WMTSOptions.prototype.matrixSet;
 /**
  * Dimensions.
  * @type {Object|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.dimensions;
 
@@ -4922,7 +4922,7 @@ olx.source.WMTSOptions.prototype.dimensions;
 /**
  * URL.
  * @type {string|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.url;
 
@@ -4946,7 +4946,7 @@ olx.source.WMTSOptions.prototype.tileLoadFunction;
 /**
  * Urls.
  * @type {Array.<string>|undefined}
- * @api
+ * @api stable
  */
 olx.source.WMTSOptions.prototype.urls;