diff --git a/browser/locales/en-US/chrome/browser/search.properties b/browser/locales/en-US/chrome/browser/search.properties
index 27351ba97694..b77c501ca9d0 100644
--- a/browser/locales/en-US/chrome/browser/search.properties
+++ b/browser/locales/en-US/chrome/browser/search.properties
@@ -23,5 +23,12 @@ cmd_clearHistory_accesskey=H
 cmd_showSuggestions=Show Suggestions
 cmd_showSuggestions_accesskey=S
 
+# LOCALIZATION NOTE (cmd_addFoundEngine): %S is replaced by the name of
+# a search engine offered by a web page. Each engine is displayed as a
+# menuitem at the bottom of the search panel.
 cmd_addFoundEngine=Add "%S"
-
+# LOCALIZATION NOTE (cmd_addFoundEngineMenu): When more than 5 engines
+# are offered by a web page, instead of listing all of them in the
+# search panel using the cmd_addFoundEngine string, they will be
+# grouped in a submenu using cmd_addFoundEngineMenu as a label.
+cmd_addFoundEngineMenu=Add search engine