diff --git a/src/wallet/monero_wallet.h b/src/wallet/monero_wallet.h
index 62743c0..f061796 100644
--- a/src/wallet/monero_wallet.h
+++ b/src/wallet/monero_wallet.h
@@ -72,6 +72,8 @@ namespace monero {
 
   /**
    * Receives progress notifications as a wallet is synchronized.
+   *
+   * TODO: make these interfaces and provide default implementation
    */
   class monero_sync_listener {
   public: