diff --git a/src/ol/render/Event.js b/src/ol/render/Event.js
index fc621c7bf9..3ecc0ccd11 100644
--- a/src/ol/render/Event.js
+++ b/src/ol/render/Event.js
@@ -33,8 +33,8 @@ class RenderEvent extends Event {
     this.frameState = opt_frameState;
 
     /**
-     * Canvas context. Only available when a Canvas renderer is used, null
-     * otherwise.
+     * Canvas context. Not available when the event is dispatched by the map. Only available
+     * when a Canvas renderer is used, null otherwise.
      * @type {CanvasRenderingContext2D|null|undefined}
      * @api
      */
diff --git a/src/ol/render/EventType.js b/src/ol/render/EventType.js
index d93e46bcd2..37e99aeca4 100644
--- a/src/ol/render/EventType.js
+++ b/src/ol/render/EventType.js
@@ -23,6 +23,7 @@ export default {
 
   /**
    * Triggered before layers are rendered.
+   * The event object will not have a `context` set.
    * @event module:ol/render/Event~RenderEvent#precompose
    * @api
    */
@@ -30,6 +31,7 @@ export default {
 
   /**
    * Triggered after all layers are rendered.
+   * The event object will not have a `context` set.
    * @event module:ol/render/Event~RenderEvent#postcompose
    * @api
    */
@@ -38,6 +40,7 @@ export default {
   /**
    * Triggered when rendering is complete, i.e. all sources and tiles have
    * finished loading for the current viewport, and all tiles are faded in.
+   * The event object will not have a `context` set.
    * @event module:ol/render/Event~RenderEvent#rendercomplete
    * @api
    */