Tweaks the README

packages/priority-queue/README.md

@@ -1,6 +1,6 @@
 # Priority Queue
 
-This module allows you to run a queue of callback while on the browser's idle time making sure the higher-priority work is performed before.
+This module allows you to run a queue of callback while on the browser's idle time making sure the higher-priority work is performed first.
 
 ## Installation
 
@@ -18,9 +18,12 @@ _This package assumes that your code will run in an **ES2015+** environment. If
 import { createQueue } from '@wordpress/priority-queue';
 
 const queue = createQueue();
+
+// Context objects.
 const ctx1 = {};
 const ctx2 = {}; 
 
+// For a given context in the queue, only the last callback is executed.
 queue.add( ctx1, () => console.log( 'This will be printed first' ) );
 queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
 queue.add( ctx2, () => console.log( 'This will be printed second' ) );