Is Genesis 32:32 a command or a historical account of a tradition?

> 
> **New American Standard Bible:**
> Therefore, to this day the sons of Israel do not eat the tendon of the hip which is on the
> socket of the hip, because he touched the socket of Jacob’s hip in the tendon of the hip.
> 
> 
> **King James Bible:** Therefore the children of Israel eat not of the sinew
> which shrank, which is upon the hollow of the thigh, unto this day:
> because he touched the hollow of Jacob's thigh in the sinew that
> shrank.
> 
> 
> [Genesis 32:32](https://biblehub.com/genesis/32-32.htm)
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/IGIog.png)](https://i.stack.imgur.com/IGIog.png)