diff --git a/src/wallet/plain_wallet_api.h b/src/wallet/plain_wallet_api.h
index 410a5c48..ec5af47d 100644
--- a/src/wallet/plain_wallet_api.h
+++ b/src/wallet/plain_wallet_api.h
@@ -48,7 +48,7 @@ namespace plain_wallet
   std::string reset_wallet_password(hwallet h, const std::string& password);
   uint64_t get_current_tx_fee(uint64_t priority); // 0 (default), 1 (unimportant), 2 (normal), 3 (elevated), 4 (priority)
   
-
+  //callback-mode for async calls
   typedef void (*callback_type)(uint64_t job_id, const std::string& job_response);
   void set_callback(callback_type callback);
 }