diff --git a/README.md b/README.md
index f9cb4a8..d030d11 100644
--- a/README.md
+++ b/README.md
@@ -679,6 +679,7 @@ _________________
 
 - [Understanding Control Systems](https://youtube.com/playlist?list=PLn8PRpmsu08q8CE0pbZ-cSrMm_WYJfVGd)
 - [Control Systems - CircuitBread (YouTube Playlist)](https://www.youtube.com/playlist?list=PLfYdTiQCV_p4YZNJWExM-5_g0fk9bHDL8)
+- [What is a PID Controller? | DigiKey](https://www.youtube.com/watch?v=tFVAaUcOm4I)
 - [PID Controller Explained](https://www.youtube.com/watch?v=fv6dLTEvl74)
 - [Understanding PID Control](https://youtube.com/playlist?list=PLn8PRpmsu08pQBgjxYFXSsODEF3Jqmm-y)
 - [PID Controller Implementation in Software - Phil's Lab #6](https://www.youtube.com/watch?v=zOByx3Izf5U)