diff --git a/docs/guide.md b/docs/guide.md
index 0272ae855a..120c4d57a5 100644
--- a/docs/guide.md
+++ b/docs/guide.md
@@ -453,6 +453,12 @@ No. The server reads session files and terminals locally, and serves them only t
 The chat needs the agent's own session file. Check that the agent runs in a herdr pane on this PC (or on an added PC) and has already written its first message. Agents without a native reader always get the terminal-text view, and the Terminal view always works.
 </details>
 
+<details>
+<summary><b>The colors look too dark, or the light theme looks dark, in Samsung Internet.</b></summary>
+
+Samsung Internet has a forced dark mode that repaints every page, including one that brings its own light and dark themes, as this app does. A light theme comes out dark, and a dark one is darkened a second time: similar shades run together, and the bars of the plan meters can look empty. Turn off **Force dark mode for web content** (**웹 콘텐츠에 어두운 화면 모드 강제 적용**) in Samsung Internet's settings, or open the app in Chrome. Reported on a Galaxy Tab S7+ ([#451](https://github.com/devswha/herdr-web-ui/issues/451)).
+</details>
+
 <details>
 <summary><b>How is this different from collie, roamgate or herdr-remote?</b></summary>