diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/MySubject.java b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/MySubject.java
index 798acf7..31b28fd 100644
--- a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/MySubject.java
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/subject/MySubject.java
@@ -8,6 +8,7 @@
 import org.ntlab.radishforandroidstudio.framework.event.MyEvent;
 import org.ntlab.radishforandroidstudio.framework.listener.MyListener;
 
+// TODO: removeListenerの追加
 public abstract class MySubject<ListenerType extends MyListener, EventType extends MyEvent> {
     protected Set<ListenerType> listenerSet = new CopyOnWriteArraySet<>();