diff --git a/src/ol/render/renderevent.js b/src/ol/render/renderevent.js
index 6d8810ae7e..9a0e647c2c 100644
--- a/src/ol/render/renderevent.js
+++ b/src/ol/render/renderevent.js
@@ -53,6 +53,7 @@ ol.render.Event = function(
   this.vectorContext = opt_vectorContext;
 
   /**
+   * An object representing the current render frame state.
    * @type {olx.FrameState|undefined}
    * @api
    */