# Documentation in 'Customizing Viewer'

**URL:** <https://pdfjs.community/t/documentation-in-customizing-viewer/2121>\
**Category:** Documentation Feedback\
**Created:** [October 20, 2022, 4:21pm UTC](https://pdfjs.community/t/documentation-in-customizing-viewer/2121 "2022-10-20T16:21:26Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![momboman4](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/momboman4/32/1059_2.png) [@momboman4](https://pdfjs.community/u/momboman4)\
**Post date:** [October 20, 2022, 4:21pm UTC](https://pdfjs.community/t/documentation-in-customizing-viewer/2121/1 "2022-10-20T16:21:26Z")

</div>

At the start of the Customizing Viewer page [here](https://pdfjs.express/documentation/ui-customization/customizing-setup)

> ### App level customization
> 
> Listen to events on the viewer element and call functions on the varructed PDF.js Express instance. Generally this is the recommended way to customize PDF.js Express within your app.

I’m pretty sure _varructed_ isn’t the word you want.

Craig

---

<div class="post-metadata">

**Author:** ![zserviss](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@zserviss](https://pdfjs.community/u/zserviss)\
**Post date:** [October 20, 2022, 4:57pm UTC](https://pdfjs.community/t/documentation-in-customizing-viewer/2121/2 "2022-10-20T16:57:51Z")

</div>

Hi Craig,

Thanks for pointing this out! I’ll get this fixed right away.

Best Regards,  
Zach Serviss  
Web Development Support Engineer  
PDFTron Systems, Inc.

Share how you are using PDF.js Express in your organization you could win a **$500 Amazon gift card. All participants will receive 6 months of PDF.js Express+ for free**. Learn more [here](https://utm.guru/ueQNw)

---

<div class="post-metadata">

**Author:** ![momboman4](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/momboman4/32/1059_2.png) [@momboman4](https://pdfjs.community/u/momboman4)\
**Post date:** [October 20, 2022, 5:34pm UTC](https://pdfjs.community/t/documentation-in-customizing-viewer/2121/3 "2022-10-20T17:34:41Z")

</div>

Hey Zach,

You’re welcome. I won’t make a habit of this but now that I have you on the ‘line’:  
When you are in the API pages:  
[https://pdfjs.express/api/](https://pdfjs.express/api/)

The ‘Events’ dropdown at the top sends you to a 404.

I promise I won’t do this anymore.

Craig

---

<div class="post-metadata">

**Author:** ![zserviss](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@zserviss](https://pdfjs.community/u/zserviss)\
**Post date:** [October 20, 2022, 5:45pm UTC](https://pdfjs.community/t/documentation-in-customizing-viewer/2121/4 "2022-10-20T17:45:32Z")

</div>

That’s all good! I really appreciate the keen eye.

Best Regards,  
Zach Serviss  
Web Development Support Engineer  
PDFTron Systems, Inc.

Share how you are using PDF.js Express in your organization you could win a **$500 Amazon gift card. All participants will receive 6 months of PDF.js Express+ for free**. Learn more [here](https://utm.guru/ueQNw)