diff --git a/kalamar.ids-mannheim.conf b/kalamar.ids-mannheim.conf
index 8674272..36890b0 100644
--- a/kalamar.ids-mannheim.conf
+++ b/kalamar.ids-mannheim.conf
@@ -29,8 +29,23 @@
     },
     navi_ext => [
       {
-        "title" => "corpora",
-        "id" => "corpus"
+        "title" => "corpus",
+        "id" => "corpus",
+        "class" => "folded",
+        "items" => [
+          {
+            "title" => "composition",
+            "id" => "composition"
+          },
+          {
+            "title" => "useful_subcorpora",
+            "id" => "useful_subcorpora"
+          },
+          {
+            "title" => "named_vc",
+            "id" => "named_vc"
+          }
+        ]
       },
       {
         "title" => "Privacy",
@@ -86,6 +101,14 @@
       en_currentdb => 'Current data set: Virtual corpus <%= t code => stash("vc") %>',
       de_compositionbysource => 'Zusammensetzung nach Quelle',
       en_compositionbysource => 'Composition by source',
+      de_Title_composition => 'Korpus-Zusammensetzung',
+      en_Title_composition => 'Corpus Composition',
+      en_Nav_composition => 'Composition',
+      de_Nav_composition => 'Zusammensetzung',
+      en_Nav_useful_subcorpora => 'Useful subcorpora',
+      de_Nav_useful_subcorpora => 'Nützliche Subkorpora',
+      en_Nav_named_vc => 'Named VC',
+      de_Nav_named_vc => 'Benamte VC',
     }
   },
   'TagHelpers-ContentBlock' => {