Why does this bash for loop syntax work?

Why does this braced syntax work $ for (( i=0; i<3; ++i )) { echo $i; } 0 1 2 when the manpage says the syntax is for (( expr1 ; expr2 ; expr3 )) ; do list ; done $ bash --version | head -1 # on linux mint virginia (ubuntu jammy) GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu) If this is a syntax addition which just has yet to be documented, when was it added?