diff --git a/README.md b/README.md
index 847e2ba1..c5d8fd62 100644
--- a/README.md
+++ b/README.md
@@ -1104,6 +1104,7 @@ https://listjs.com
 * [jsemu](https://github.com/fcambus/jsemu) - A list of emulators written in the JavaScript programming language.
 * [rrweb](https://github.com/rrweb-io/rrweb) - Records the DOM and user interactions as a typed JSON event stream and replays them pixel-perfect.
 * [enum-plus](https://github.com/shijistar/enum-plus) - A drop-in enhancement for native TypeScript enums, adding display text, internationalization and full type safety.
+* [penciled](https://github.com/marcellosso/penciled) - Persistent text highlights and notes for any web page, painted with the CSS Custom Highlight API without touching the DOM.
 
 # Worth Reading