diff --git a/i18n/src/main/res/values/strings.xml b/i18n/src/main/res/values/strings.xml
index b2239b1d..eb48badb 100644
--- a/i18n/src/main/res/values/strings.xml
+++ b/i18n/src/main/res/values/strings.xml
@@ -21,6 +21,9 @@
     <string name="menu_open_file">Open</string>
     <string name="menu_hide">Hide</string>
     <string name="menu_unhide">Don\'t hide</string>
+    <!-- Shown in a snackbar after an item has been hidden. %1$s: label of the item -->
+    <string name="msg_item_hidden">%1$s has been hidden.</string>
+    <string name="action_undo">Undo</string>
     <string name="menu_hidden_items">Hidden items</string>
     <!-- Delete something (a file or a web search shortcut) -->
     <string name="menu_delete">Delete</string>