diff --git a/src/endpoints/forms.tsp b/src/endpoints/forms.tsp
index 36752da..3295450 100644
--- a/src/endpoints/forms.tsp
+++ b/src/endpoints/forms.tsp
@@ -116,6 +116,7 @@ namespace Forms {
         default_title?: string;
 
         visibility?: Visibility;
+        answer_visibility?: Visibility;
       },
     ): {
       @statusCode statusCode: 200;
diff --git a/src/models/form.tsp b/src/models/form.tsp
index 996b9cc..c91ae03 100644
--- a/src/models/form.tsp
+++ b/src/models/form.tsp
@@ -57,7 +57,16 @@ model Form {
     webhook_url: url;
 
     default_title: string;
+
+    /**
+     * フォーム自体を公開するかどうか
+     */
     visibility: Visibility;
+
+    /**
+     * 回答を公開するかどうか
+     */
+    answer_visibility: Visibility;
   };
   metadata: {
     created_at: utcDateTime;