Blender keyed particles system with path option - Tutorial

As I was looking for information about the particles system path option, I wasn’t able to find a tutorial on that option, so I made my own one.

This is a short tutorial to show how to use keyed particles system and to demonstrate the “path” option usage.

Youtube video is here:

Let me know your comments.

thanks a lot for the tutorial! I searched recently information about keyed systems in the oficial blender reference manual(https://www.blender.org/manual/physics/particles/physics/keyed.html) But that explanation seems to be outdated (for example, they talk about a option called “first” that I doubt about its existence). So, your tutorial explains much better how to set a keyed particle system.