diff --git a/source/src/main/java/one/nem/lacerta/source/database/dao/LibraryDao.java b/source/src/main/java/one/nem/lacerta/source/database/dao/LibraryDao.java
index 8948b9dd..96cb18a9 100644
--- a/source/src/main/java/one/nem/lacerta/source/database/dao/LibraryDao.java
+++ b/source/src/main/java/one/nem/lacerta/source/database/dao/LibraryDao.java
@@ -1,6 +1,7 @@
 package one.nem.lacerta.source.database.dao;
 
 import androidx.room.Dao;
+import androidx.room.Insert;
 import androidx.room.Query;
 
 import java.util.List;
@@ -10,6 +11,7 @@ import one.nem.lacerta.source.database.entity.LibraryEntity;
 @Dao
 public interface LibraryDao {
 
+    // Select
     @Query("SELECT * FROM Library WHERE id = :id")
     LibraryEntity findById(String id);
 
@@ -19,6 +21,17 @@ public interface LibraryDao {
     @Query("SELECT * FROM Library WHERE id IN (:ids)")
     List<LibraryEntity> findByIds(List<String> ids);
 
-    // WIP
-    // TODO-rca: Insert, Update, Delete
+
+    // Insert
+    @Insert
+    void insert(LibraryEntity libraryEntity);
+
+    @Insert
+    void insertAll(LibraryEntity... libraryEntities);
+
+    @Insert
+    void insertAll(List<LibraryEntity> libraryEntities);
+
+    // Update
+    // TODO-rca: 未実装
 }