diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index 15824bc7..8693213a 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -2084,5 +2084,9 @@
   "prefs_chatgpt_win_position_info":{
     "message": "Leave empty to use the default position.",
     "description": ""
+  },
+  "prefs_OptionText_action_auto_batch": {
+    "message": "When the email is received",
+    "description": ""
   }
 }
\ No newline at end of file
diff --git a/options/mzta-options-default.js b/options/mzta-options-default.js
index c7cbfcd8..c278455c 100644
--- a/options/mzta-options-default.js
+++ b/options/mzta-options-default.js
@@ -138,7 +138,7 @@ export const prefs_default = {
     spamfilter_threshold: 70,
     spamfilter_enabled_accounts: [],
     summarize: false,
-    summarize_auto: 1,                   // 0: disabled, 1: manual button, 2: automatic
+    summarize_auto: 1,                   // 0: disabled, 1: manual button, 2: automatic, 3: batch processing
     summarize_display_mode: 'inline',    // 'inline' or 'webchat'
     summarize_max_display_length: 0,     // 0 = no limit, otherwise max chars shown inline
     spamfilter_show_msg_panel: true,
diff --git a/pages/summarize/mzta-summarize.html b/pages/summarize/mzta-summarize.html
index ea6f59c7..2bf1d486 100644
--- a/pages/summarize/mzta-summarize.html
+++ b/pages/summarize/mzta-summarize.html
@@ -34,6 +34,7 @@
                   <option value="0">__MSG_prefs_OptionText_summarize_auto_disabled__</option>
                   <option value="1">__MSG_prefs_OptionText_summarize_auto_manual__</option>
                   <option value="2">__MSG_prefs_OptionText_summarize_auto_automatic__</option>
+                  <option value="3">__MSG_prefs_OptionText_action_auto_batch__</option>
                 </select>
                 <br>__MSG_prefs_OptionText_summarize_auto_Info__
               </label>