diff --git a/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java b/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
index 020f08ef..e365c66c 100644
--- a/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
+++ b/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
@@ -163,6 +163,9 @@ public class ViewerContainerFragment extends Fragment {
         });
     }
 
+    /**
+     * ドキュメント名を変更する
+     */
     private void renameDocument() {
         MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getContext());
         builder.setTitle("ファイル名の変更");