diff --git a/README.md b/README.md
index 0cdf9fe..de528d3 100644
--- a/README.md
+++ b/README.md
@@ -401,6 +401,7 @@ _________________
 - [how does UART work??? (explained clearly)](https://www.youtube.com/watch?v=V6m2skVlsQI)
 - [Basics of UART Communication | UART Frame Structure | RS 232 Basics | Part1](https://www.youtube.com/watch?v=JuvWbRhhpdI)
 - [Understanding UART Communication Programming | UART Peripherals | Part 2](https://www.youtube.com/watch?v=QmjKRwgddxw)
+- [The RS-232 protocol](https://www.youtube.com/watch?v=AHYNxpqKqwo)
 
 ##### I2C
 
@@ -435,6 +436,11 @@ _________________
 - [How does Modbus Communication Protocol Work?](https://www.youtube.com/watch?v=JBGaInI-TG4)
 - [MODBUS STM32](https://www.youtube.com/playlist?list=PLfIJKC1ud8ggRvaEsMjSEDazoBAnY4MUv)
 
+##### RS485
+
+- [What is RS485 and How it's used in Industrial Control Systems?](https://www.youtube.com/watch?v=3wgKcUDlHuM)
+- [What is RS-485?](https://www.youtube.com/watch?v=bt9Px51eP6s)
+
 ##### CoAP & MQTT
 
 - [#144 Internet Protocols: CoAP vs MQTT, Network Sniffing, and preparation for IKEA Tradfri Hacking](https://www.youtube.com/watch?v=pfG8uEDZj5g)