diff --git a/docs/browser-bugs.md b/docs/browser-bugs.md
index d83174a9..37bcc5a2 100644
--- a/docs/browser-bugs.md
+++ b/docs/browser-bugs.md
@@ -42,3 +42,7 @@ This page lists several of the browser bugs that have affected Yomichan over the
 * **Date**: 2020-06-05
 * **Links**: [Report](https://bugs.chromium.org/p/chromium/issues/detail?id=1087188), [Demo](https://github.com/toasted-nutbread/chrome-animated-text-color-bug)
 
+## Pen pointer events have various issues
+* **Browser**: Firefox
+* **Date**: 2020-09-12
+* **Links**: [#819](https://github.com/FooSoft/yomichan/pull/819), [#820](https://github.com/FooSoft/yomichan/pull/820), [#821](https://github.com/FooSoft/yomichan/pull/821), [#824](https://github.com/FooSoft/yomichan/pull/824), [Report 1](https://bugzilla.mozilla.org/show_bug.cgi?id=1449660), [Report 2](https://bugzilla.mozilla.org/show_bug.cgi?id=1487509), [Report 3](https://bugzilla.mozilla.org/show_bug.cgi?id=1583480), [Report 4](https://bugzilla.mozilla.org/show_bug.cgi?id=1583519), [Report 5](https://bugzilla.mozilla.org/show_bug.cgi?id=1631377)