diff --git a/src/ol/layer/WebGLTile.js b/src/ol/layer/WebGLTile.js
index de66487471..77dc77b1a0 100644
--- a/src/ol/layer/WebGLTile.js
+++ b/src/ol/layer/WebGLTile.js
@@ -16,6 +16,8 @@ import {assign} from '../obj.js';
 
 /**
  * @typedef {Object} Style
+ * Translates tile data to rendered pixels.
+ *
  * @property {Object<string, number>} [variables] Style variables.  Each variable must hold a number.
  * @property {import("../style/expressions.js").ExpressionValue} [color] An expression applied to color values.
  * @property {import("../style/expressions.js").ExpressionValue} [brightness=0] Value used to decrease or increase
diff --git a/src/ol/style/expressions.js b/src/ol/style/expressions.js
index 5c33fb0da9..3ac890aedf 100644
--- a/src/ol/style/expressions.js
+++ b/src/ol/style/expressions.js
@@ -74,6 +74,7 @@ import {asArray, isStringColor} from '../color.js';
  * * {@link module:ol/color~Color}
  *
  * @typedef {Array<*>|import("../color.js").Color|string|number|boolean} ExpressionValue
+ * @api
  */
 
 /**