diff --git a/flix/motors.ino b/flix/motors.ino
index fa76d84..91a5f94 100644
--- a/flix/motors.ino
+++ b/flix/motors.ino
@@ -1,6 +1,10 @@
 // Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
 // Repository: https://github.com/okalachev/flix
 
+// https://habr.com/ru/company/first/blog/664922/
+// esc: https://aliexpress.com/item/4000280617058.html (KINGDUO Micro Mini 4A 1S Brushed Esc 3.6-6V)
+// motor: https://aliexpress.com/item/32731613504.html (8520 3.7V)
+
 #define MOTOR_0_PIN 12
 #define MOTOR_1_PIN 13
 #define MOTOR_2_PIN 14
diff --git a/flix/wifi.ino b/flix/wifi.ino
index 9ae5e8e..c64ed4b 100644
--- a/flix/wifi.ino
+++ b/flix/wifi.ino
@@ -1,6 +1,9 @@
 // Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
 // Repository: https://github.com/okalachev/flix
 
+// https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WiFiAccessPoint/WiFiAccessPoint.ino
+// https://github.com/espressif/arduino-esp32/blob/master/libraries/WiFi/examples/WiFiClient/WiFiClient.ino
+
 #if WIFI_ENABLED == 1
 
 #include <WiFi.h>