diff --git a/app/views/admin/announcements/previews/show.html.haml b/app/views/admin/announcements/previews/show.html.haml
index fdfbf598b56..54d5d45ed6f 100644
--- a/app/views/admin/announcements/previews/show.html.haml
+++ b/app/views/admin/announcements/previews/show.html.haml
@@ -7,6 +7,8 @@
       = material_symbol 'chevron_left'
       = t('admin.announcements.back')
 
+.flash-message.info= t('admin.announcements.preview.disclaimer')
+
 %p.lead
   = t('admin.announcements.preview.explanation_html', count: @user_count, display_count: number_with_delimiter(@user_count))
 
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 4c5e1466f7e..f0e1f86c4e5 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -319,6 +319,7 @@ en:
         create: Create announcement
         title: New announcement
       preview:
+        disclaimer: As users cannot opt out of them, email notifications should be limited to important announcements such as personal data breach or server closure notifications.
         explanation_html: 'The email will be sent to <strong>%{display_count} users</strong>. The following text will be included in the e-mail:'
         title: Preview announcement notification
       publish: Publish