diff --git a/api-samples/readingList/README.md b/api-samples/readingList/README.md
index 09ffa3018a..a937b93282 100644
--- a/api-samples/readingList/README.md
+++ b/api-samples/readingList/README.md
@@ -4,10 +4,17 @@ This sample demonstrates using the [chrome.readingList](https://developer.chrome
 
 ## Overview
 
-Once this extension is installed, clicking this extension's action icon will open an extension page.
+The extension's action icon opens a page that allows you to add new items, as well as update or delete existing ones.
 
 <img src="screenshot.png" height=300 alt="Screenshot showing the chrome.readingList API demo running in Chrome.">
 
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Click on the action icon.
+4. An extension page will open.
+
 ## Implementation Notes
 
 Listeners are added for all events, so the table automatically updates when data in the reading list changes.
diff --git a/api-samples/readingList/index.js b/api-samples/readingList/index.js
index 6a44bdb488..e5ca1a1212 100644
--- a/api-samples/readingList/index.js
+++ b/api-samples/readingList/index.js
@@ -59,7 +59,7 @@ async function updateUI() {
   for (const item of items) {
     // Use existing row if possible, otherwise create a new one.
     const row =
-      document.querySelector(`[data-url="${item.url}"`) ||
+      document.querySelector(`[data-url="${item.url}"]`) ||
       document.getElementById(TABLE_ITEM_TEMPLATE_ID).content.cloneNode(true)
         .children[0];
 
diff --git a/api-samples/readingList/manifest.json b/api-samples/readingList/manifest.json
index b5bd715a5f..4c15bbaa7e 100644
--- a/api-samples/readingList/manifest.json
+++ b/api-samples/readingList/manifest.json
@@ -2,7 +2,7 @@
   "name": "Reading List API Demo",
   "version": "1.0",
   "manifest_version": 3,
-  "description": "Uses the chrome.readingList API to display reading list entries.",
+  "description": "Uses the chrome.readingList API to display, update and remove reading list entries.",
   "background": {
     "service_worker": "sw.js"
   },