diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/NoteDatabase.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/NoteDatabase.kt
index 1c213b2..ce99bfb 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/NoteDatabase.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/NoteDatabase.kt
@@ -12,7 +12,7 @@ import com.example.epicdatabaseexample.db.note.NoteDao
 import com.example.epicdatabaseexample.db.note.NoteEntity
 
 @Database(
-    version = 2,
+    version = 3,
     exportSchema = false,
     entities = [
         NoteEntity::class,
@@ -39,16 +39,27 @@ abstract class NoteDatabase : RoomDatabase() {
         private fun migrationList() = arrayOf(
             object : Migration(1, 2) {
                 override fun migrate(database: SupportSQLiteDatabase) {
-                    database.execSQL("CREATE TABLE $PERSON_TABLE (" +
-                            "${PersonEntity.COLUMN_NAME} TEXT NOT NULL," +
-                            "PRIMARY KEY(${PersonEntity.COLUMN_NAME})" +
-                            ")")
-                    database.execSQL("ALTER TABLE $NOTE_TABLE " +
-                            "ADD COLUMN ${NoteEntity.COLUMN_PERSON_NAME} TEXT NOT NULL " +
-                            "DEFAULT ('${PersonEntity.DEFAULT_PERSON_NAME}')")
+                    database.execSQL(
+                        "CREATE TABLE $PERSON_TABLE (" +
+                                "${PersonEntity.COLUMN_NAME} TEXT NOT NULL," +
+                                "PRIMARY KEY(${PersonEntity.COLUMN_NAME})" +
+                                ")"
+                    )
+                    database.execSQL(
+                        "ALTER TABLE $NOTE_TABLE " +
+                                "ADD COLUMN ${NoteEntity.COLUMN_PERSON_NAME} TEXT NOT NULL " +
+                                "DEFAULT ('${PersonEntity.DEFAULT_PERSON_NAME}')"
+                    )
                 }
             },
-            // TODO Добавить миграцию.
+            object : Migration(2, 3) {
+                override fun migrate(database: SupportSQLiteDatabase) {
+                    database.execSQL(
+                        "ALTER TABLE $NOTE_TABLE " +
+                                "ADD COLUMN ${NoteEntity.COLUMN_IS_COMPLETED} INTEGER NOT NULL DEFAULT 0"
+                    )
+                }
+            }
         )
 
         private fun createDatabaseInstance(application: Application): NoteDatabase {
diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteDao.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteDao.kt
index 8645616..3166d04 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteDao.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteDao.kt
@@ -26,8 +26,9 @@ abstract class NoteDao {
     @Query("DELETE FROM note_table")
     abstract fun deleteAllNote(): Completable
 
-    // TODO Добавить метод для обновления одного элемента.
-    //  Что можно указать в качестве возвращаемого типа?
-    //  Напомню, что выше есть метод observeNoteList, который будет вызываться при любом
-    //  изменении списка в Базе Данных.
+    @Update
+    abstract fun updateNote(note: NoteEntity): Completable
+
+    @Query("UPDATE note_table SET is_completed = :isCompleted where id = :noteId")
+    abstract fun setCompleted(noteId: Int, isCompleted: Boolean): Completable
 }
\ No newline at end of file
diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteEntity.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteEntity.kt
index b42b9b3..7ba0dca 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteEntity.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/db/note/NoteEntity.kt
@@ -22,10 +22,8 @@ data class NoteEntity(
     @ColumnInfo(name = COLUMN_PERSON_NAME)
     var personName: String = PersonEntity.DEFAULT_PERSON_NAME,
 
-    // TODO Нужно добавить нове поле isCompleted типа Boolean.
-    //  В SQLite не поддерживается Boolean, но в Room его можно использовать.
-    //  Поэтому поле делаем именно Boolean, а при добавлении миграции - нужно будет погуглить,
-    //  как обойти это ограничение.
+    @ColumnInfo(name = COLUMN_IS_COMPLETED)
+    var isCompleted: Boolean = false
 ) {
 
     companion object {
@@ -33,5 +31,6 @@ data class NoteEntity(
         const val COLUMN_TITLE = "title"
         const val COLUMN_DESCRIPTION = "descriptions"
         const val COLUMN_PERSON_NAME = "person_name"
+        const val COLUMN_IS_COMPLETED = "is_completed"
     }
 }
\ No newline at end of file
diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteDiffUtilCallback.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteDiffUtilCallback.kt
index 7c8c9af..097d385 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteDiffUtilCallback.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteDiffUtilCallback.kt
@@ -10,6 +10,17 @@ class NoteDiffUtilCallback : DiffUtil.ItemCallback<NoteEntity>() {
     }
 
     override fun areContentsTheSame(oldItem: NoteEntity, newItem: NoteEntity): Boolean {
-        return false
+        return oldItem == newItem
     }
+
+    override fun getChangePayload(oldItem: NoteEntity, newItem: NoteEntity): Any? {
+        val isCompletedChanged = oldItem.isCompleted != newItem.isCompleted
+        return if (isCompletedChanged)
+            NotePayload(isCompletedChanged)
+        else null
+    }
+
+    data class NotePayload(
+        val isCompleteChanged: Boolean
+    )
 }
\ No newline at end of file
diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListAdapter.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListAdapter.kt
index 192174f..7170dab 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListAdapter.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListAdapter.kt
@@ -20,15 +20,38 @@ class NoteListAdapter(
             onNoteClick.invoke(note.id)
         }
         holder.personName.text = note.personName
-        // TODO Раскомментировать, после добавления нового поля в NoteEntity.
-//        holder.isCompleted.setOnClickListener {
-//            onIsCompletedClick.invoke(note.copy(
-//                isCompleted = !note.isCompleted
-//            ))
-//        }
-//        val isCompletedChanged = note.isCompleted != holder.isCompleted.isChecked
-//        if (isCompletedChanged) {
-//            holder.isCompleted.isChecked = note.isCompleted
-//        }
+        holder.isCompleted.setOnClickListener {
+            onIsCompletedClick.invoke(
+                note.copy(
+                    isCompleted = !note.isCompleted
+                )
+            )
+        }
+        val isCompletedChanged = note.isCompleted != holder.isCompleted.isChecked
+        if (isCompletedChanged) {
+            holder.isCompleted.isChecked = note.isCompleted
+        }
+    }
+
+    override fun onBindViewHolder(
+        holder: NoteViewHolder,
+        position: Int,
+        payloads: MutableList<Any>
+    ) {
+        if (payloads.isEmpty()) {
+            super.onBindViewHolder(holder, position, payloads)
+            return
+        }
+        val note = getItem(position)
+        holder.isCompleted.setOnClickListener {
+            onIsCompletedClick.invoke(
+                note.copy(
+                    isCompleted = !note.isCompleted
+                )
+            )
+        }
+        val notePayload = payloads.first() as NoteDiffUtilCallback.NotePayload
+        if (notePayload.isCompleteChanged)
+            holder.isCompleted.isChecked = note.isCompleted
     }
 }
\ No newline at end of file
diff --git a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListViewModel.kt b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListViewModel.kt
index 3344f2c..8594eec 100644
--- a/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListViewModel.kt
+++ b/EpicDatabseExample/app/src/main/java/com/example/epicdatabaseexample/ui/note_list/NoteListViewModel.kt
@@ -35,9 +35,11 @@ class NoteListViewModel constructor(
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe { noteList ->
-                    state.postValue(NoteListViewState(
-                        noteList = noteList
-                    ))
+                    state.postValue(
+                        NoteListViewState(
+                            noteList = noteList
+                        )
+                    )
                 }
         )
     }
@@ -48,9 +50,11 @@ class NoteListViewModel constructor(
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe {
-                    state.postValue(state.value!!.copy(
-                        noteList = emptyList()
-                    ))
+                    state.postValue(
+                        state.value!!.copy(
+                            noteList = emptyList()
+                        )
+                    )
                 }
         )
     }
@@ -64,7 +68,27 @@ class NoteListViewModel constructor(
     }
 
     fun onIsCompletedClick(note: NoteEntity) {
-        // TODO Добавить вызов noteDao для обновления элемента в таблице.
+        /*compositeDisposable.add(
+            noteDao.insertNote(note)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe()
+        )*/
+
+       /* compositeDisposable.add(
+            noteDao.updateNote(note)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe()
+        )*/
+
+        compositeDisposable.add(
+            noteDao.setCompleted(note.id, note.isCompleted)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe()
+        )
+
     }
 
     override fun onCleared() {