diff --git a/ESP-IDF_Robot_RC/main/espnow_example_main.c b/ESP-IDF_Robot_RC/main/espnow_example_main.c
index cf4d1c582..9082cd282 100755
--- a/ESP-IDF_Robot_RC/main/espnow_example_main.c
+++ b/ESP-IDF_Robot_RC/main/espnow_example_main.c
@@ -39,7 +39,7 @@ typedef struct {
     uint8_t     motor4_rpm_pcm;
 } __attribute__((packed)) sensors_data_t;
 
-
+// MAC address of receiver. For one-to-many broadcast, change MAC address to FF:FF...:FF
 static uint8_t receiver_mac[ESP_NOW_ETH_ALEN]   = {0xE4, 0xB0, 0x63, 0x17, 0x9E, 0x45};
 
 static esp_now_peer_info_t peerInfo;