Saving User_Setup_Select.h configuration

[trayracing]

This must be a common question, but I didn't find the answer...
I have a minimal project working with TFT_eSPI in PlatformIO after doing the personal change to User_Setup_Select.h. But, how do I save that change in git? I can commit my project files and my platformio.ini, and the .ini will fetch the TFT_eSPI files when I next build on another machine, but that won't include my User_Setup_Select.h change.

I could fork TFT_eSPI, change the one file, and point my platformio.ini at my fork, but then I'll forever be managing my own fork. Is there a simpler way to do this (really a git submodules question, I guess), or is there a better route to configuring TFT_eSPI?

[trayracing]

Aha. It's all due to a broken link on the wiki:

The procedure is explained here.