--- a/mobile/android/base/locales/en-US/android_strings.dtd
+++ b/mobile/android/base/locales/en-US/android_strings.dtd
@@ -330,18 +330,21 @@ size. -->
 <!ENTITY pref_panels_show "Show">
 <!ENTITY pref_panels_hide "Hide">
 <!ENTITY pref_panels_reorder "Change order">
 <!ENTITY pref_panels_move_up "Move up">
 <!ENTITY pref_panels_move_down "Move down">
 
 <!ENTITY datareporting_notification_title "&brandShortName; stats &amp; data">
 <!ENTITY datareporting_notification_action "Choose what to share">
+<!-- Used in datareporting_notification_ticket_text, but unused in strings.xml. -->
 <!ENTITY datareporting_notification_action_long "Choose what information to share">
 <!ENTITY datareporting_notification_summary "To improve your experience, &brandShortName; automatically sends some information to &vendorShortName;.">
+<!-- When this item is removed, also remove datareporting_notification_action_long:
+     it is unused in strings.xml. -->
 <!ENTITY datareporting_notification_ticker_text "&datareporting_notification_title;: &datareporting_notification_action_long;">
 
 <!-- Localization note (datareporting_fhr_title, datareporting_fhr_summary2,
      reporting_telemetry_title, datareporting_telemetry_summary,
      datareporting_crashreporter_summary) : These match the strings in
      en-US/chrome/browser/preferences/advanced.dtd (healthReportSection.label,
      healthReportDesc.label, telemetrySection.label, telemetryDesc.label,
      crashReporterDesc.label). -->