diff --git a/source/src/main/java/one/nem/lacerta/source/database/entity/DocumentEntity.java b/source/src/main/java/one/nem/lacerta/source/database/entity/DocumentEntity.java
index 1e7891e9..edd7a2d1 100644
--- a/source/src/main/java/one/nem/lacerta/source/database/entity/DocumentEntity.java
+++ b/source/src/main/java/one/nem/lacerta/source/database/entity/DocumentEntity.java
@@ -36,4 +36,7 @@ public class DocumentEntity {
 
     @ColumnInfo(name = "parent_id")
     public String parentId; // 親フォルダID
+
+    @ColumnInfo(name = "is_combined")
+    public boolean isCombined; // 結合されたドキュメントかどうか
 }