diff --git a/src/ol/size.js b/src/ol/size.js
index 838d04e288..2fb84be2a7 100644
--- a/src/ol/size.js
+++ b/src/ol/size.js
@@ -5,7 +5,7 @@ goog.provide('ol.size');
 /**
  * An array of numbers representing a size: `[width, height]`.
  * @typedef {Array.<number>}
- * @api
+ * @api stable
  */
 ol.Size;