diff --git a/AGENTS.md b/AGENTS.md
index 7594401..03134e9 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -9,6 +9,7 @@ Each userscript is a single `*.user.js` file at the repo root. A script owns eve
 - No shared modules, no build step, no bundler. A file must install and run as-is by pasting it into a userscript manager.
 - New script → new `name.user.js` file. Do not factor common code into helpers across files; duplication across scripts is acceptable and expected here.
 - Every file starts with a complete `==UserScript==` metadata block (`@name`, `@namespace`, `@version`, `@description`, `@match`, `@run-at`, and any `@grant`/`@connect`).
+- Keep scripts ASCII-only (use `-`, `"`, `...`, plain text labels). Some userscript managers decode files as latin-1, turning UTF-8 punctuation/emoji into mojibake (e.g. `—` → `—`).
 
 ## Linting