diff --git a/src/main/kotlin/wanijo/wanijo2/domain/document.kt b/src/main/kotlin/wanijo/wanijo2/domain/document.kt
index 951f6eb..87eb19f 100644
--- a/src/main/kotlin/wanijo/wanijo2/domain/document.kt
+++ b/src/main/kotlin/wanijo/wanijo2/domain/document.kt
@@ -53,6 +53,11 @@ data class Document(
             updatedAt = Instant.now(),
             dateFields = dateFields.filter { it.id != fieldId }.toSet()
         )
+
+    fun updated() =
+        copy(
+            updatedAt = Instant.now()
+        )
 }
 
 @Table("T_DOCUMENT")
diff --git a/src/main/kotlin/wanijo/wanijo2/domain/handler/AssignTaggingHandler.kt b/src/main/kotlin/wanijo/wanijo2/domain/handler/AssignTaggingHandler.kt
index f3b154d..56f43e8 100644
--- a/src/main/kotlin/wanijo/wanijo2/domain/handler/AssignTaggingHandler.kt
+++ b/src/main/kotlin/wanijo/wanijo2/domain/handler/AssignTaggingHandler.kt
@@ -1,13 +1,16 @@
 package wanijo.wanijo2.domain.handler
 
 import org.springframework.stereotype.Service
+import wanijo.wanijo2.domain.DocumentDao
 import wanijo.wanijo2.domain.DocumentTagging
 import wanijo.wanijo2.domain.DocumentTaggingDao
 import wanijo.wanijo2.domain.event.AssignTaggingCommand
+import wanijo.wanijo2.http.DocumentNotFound
 
 @Service
 class AssignTaggingHandler(
-    val taggingDao: DocumentTaggingDao
+    val taggingDao: DocumentTaggingDao,
+    val documentDao: DocumentDao
 ) {
 
     fun exec(command: AssignTaggingCommand) {
@@ -17,6 +20,11 @@ class AssignTaggingHandler(
                 command.tagId
             )
         )
+        documentDao.save(
+            (documentDao
+                .findById(command.documentId) ?: throw DocumentNotFound())
+                .updated()
+        )
     }
 
 }
diff --git a/src/main/kotlin/wanijo/wanijo2/domain/handler/DeleteTaggingHandler.kt b/src/main/kotlin/wanijo/wanijo2/domain/handler/DeleteTaggingHandler.kt
index 2a770f8..1b75946 100644
--- a/src/main/kotlin/wanijo/wanijo2/domain/handler/DeleteTaggingHandler.kt
+++ b/src/main/kotlin/wanijo/wanijo2/domain/handler/DeleteTaggingHandler.kt
@@ -1,12 +1,15 @@
 package wanijo.wanijo2.domain.handler
 
 import org.springframework.stereotype.Service
+import wanijo.wanijo2.domain.DocumentDao
 import wanijo.wanijo2.domain.DocumentTaggingDao
 import wanijo.wanijo2.domain.event.DeleteTaggingCommand
+import wanijo.wanijo2.http.DocumentNotFound
 
 @Service
 class DeleteTaggingHandler(
-    val taggingDao: DocumentTaggingDao
+    val taggingDao: DocumentTaggingDao,
+    val documentDao: DocumentDao
 ) {
 
     fun exec(command: DeleteTaggingCommand) {
@@ -14,6 +17,11 @@ class DeleteTaggingHandler(
             command.documentId,
             command.tagId
         )
+        documentDao.save(
+            (documentDao
+                .findById(command.documentId) ?: throw DocumentNotFound())
+                .updated()
+        )
     }
 
 }