diff --git a/CONTRIBUTING.Sharkey.md b/CONTRIBUTING.Sharkey.md
index 04aab2062c..b4e6a90270 100644
--- a/CONTRIBUTING.Sharkey.md
+++ b/CONTRIBUTING.Sharkey.md
@@ -60,6 +60,11 @@ following:
   run it with `pnpm test` and `pnpm lint`. See the [testing
   section](#testing) for more info.
 
+- If this MR includes new translated strings, or changes to existing
+  translations, make sure you have edited `sharkey-locales/en-US.yml`
+  and *not* any of the files under `locales/` (the files under
+  `locales/` must stay identical to Misskey)
+
 - If this MR includes UI changes, please attach a screenshot in the
   text.