Hey Muriel
(1)Whoever knowingly mutilates, defaces, physically defiles, burns, maintains on the floor or ground, or tramples upon any flag of the United States shall be fined under this title or imprisoned for not more than one year, or both.
https://www.law.cornell.edu/uscode/text/18/700#:~:text=(a)%20read%20as%20follows%3A,one%20year%2C%20or%20both.%E2%80%9D
"Deface: to mar the appearance of : injure by effacing significant details"
https://www.merriam-webster.com/dictionary/deface
Adding an improper star to the important 50-star count would constitute "defacing".
Especially since the Congressional Record is REPLETE with failed attempts to add D.C. as the 51st State.
Let's see the selected Mayor of D.C. burn the flag.