diff --git a/webui/language/en/messages.php b/webui/language/en/messages.php
index c2206859..8badcf3d 100644
--- a/webui/language/en/messages.php
+++ b/webui/language/en/messages.php
@@ -271,6 +271,8 @@
 $_['text_policy_group'] = "Policy group";
 $_['text_policy_name'] = "Policy name";
 $_['text_previous'] = "Previous";
+$_['text_preview_pane'] = "Preview Pane";
+$_['text_preview_pane_hint'] = "Click on a message to show";
 $_['text_print_message'] = "Print";
 $_['text_private'] = "Private";
 $_['text_processed_emails'] = "Processed emails";