diff --git a/src/main/java/com/example/cosmos_serversb/entities/Group.java b/src/main/java/com/example/cosmos_serversb/entities/Group.java
index 47ac114..7b34aaa 100644
--- a/src/main/java/com/example/cosmos_serversb/entities/Group.java
+++ b/src/main/java/com/example/cosmos_serversb/entities/Group.java
@@ -13,7 +13,7 @@
 public class Group {
     private String gId;
     private String uri, name;
-    private Set<User> members = new HashSet<>();//HashSetでいいのかな？
+    private Set<User> members = new HashSet<>();
     private Set<Request> requests;
 
     public Group(){
@@ -88,6 +88,7 @@
     public void addMember(String uId){
         User user = Users.getInstance().getUserById(uId);
         if(user != null) {
+            //userが既に登録されている場合の例外処理は未実装。
             members.add(user);
             user.addGroups(this);
             Session session = SessionManager.getInstance().getSession();