Qos, BW, traffic

Hello.
I have a problem.
I install tc and want to shape traffic for wlan0-1
then i enter : tc qdisc add dev wlan0-1 root tbf latency 100ms burst 16K rate 40mbit ; it applies and work, but
after restarting router, tc for wlan0-1 set to default.
Why?

You might start with the OpenWrt/LEDE documentation...

https://openwrt.org/docs/guide-user/network/traffic-shaping/sqm

how is bound sqm(auto script) with manually add discipline ?

Manual changes must be placed into a file and run every time it boots. See docs for which files are available.

i understood, thank you