--- a/browser/locales/en-US/chrome/browser/browser.dtd
+++ b/browser/locales/en-US/chrome/browser/browser.dtd
@@ -387,16 +387,17 @@ These should match what Safari and other
 <!ENTITY customizeMenu.removeFromMenu.label "Remove from Menu">
 <!ENTITY customizeMenu.removeFromMenu.accesskey "R">
 <!ENTITY customizeMenu.addMoreItems.label "Add More Items…">
 <!ENTITY customizeMenu.addMoreItems.accesskey "A">
 
 <!ENTITY openCmd.commandkey           "l">
 <!ENTITY urlbar.placeholder2          "Search or enter address">
 <!ENTITY urlbar.accesskey             "d">
+<!-- LOCALIZATION NOTE (urlbar.extension.label): Used to indicate that a selected autocomplete entry is provided by an extension. -->
 <!ENTITY urlbar.extension.label       "Extension:">
 <!ENTITY urlbar.switchToTab.label     "Switch to tab:">
 
 <!ENTITY urlbar.searchSuggestionsNotification.question "Would you like to improve your search experience with suggestions?">
 <!ENTITY urlbar.searchSuggestionsNotification.learnMore "Learn more…">
 <!ENTITY urlbar.searchSuggestionsNotification.learnMore.accesskey "l">
 <!ENTITY urlbar.searchSuggestionsNotification.disable "No">
 <!ENTITY urlbar.searchSuggestionsNotification.disable.accesskey "n">