diff --git a/core/java/android/net/nsd/NsdManager.java b/core/java/android/net/nsd/NsdManager.java
index 83c4691..4c33c36 100644
--- a/core/java/android/net/nsd/NsdManager.java
+++ b/core/java/android/net/nsd/NsdManager.java
@@ -393,6 +393,8 @@
                     ((RegistrationListener) listener).onUnregistrationFailed(ns, message.arg1);
                     break;
                 case UNREGISTER_SERVICE_SUCCEEDED:
+                    // TODO: do not unregister listener until service is unregistered, or provide
+                    // alternative way for unregistering ?
                     removeListener(message.arg2);
                     ((RegistrationListener) listener).onServiceUnregistered(ns);
                     break;