diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index f16e0d7e93d..6c349607322 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -790,7 +790,7 @@ en:
     delete_old_hidden_posts: "Auto-delete any hidden posts that stay hidden for more than 30 days."
     default_locale: "The default language of this Discourse instance (ISO 639-1 Code)"
     allow_user_locale: "Allow users to choose their own language interface preference"
-    set_locale_from_accept_language_header: "set interface language for anonymous users from their web browser's language headers."
+    set_locale_from_accept_language_header: "set interface language for anonymous users from their web browser's language headers. (EXPERIMENTAL, does not work with anonymous cache)"
     min_post_length: "Minimum allowed post length in characters"
     min_first_post_length: "Minimum allowed first post (topic body) length in characters"
     min_private_message_post_length: "Minimum allowed post length in characters for messages"