Hi Hans, It seems that Arabic or Persian numerals (for instance in section numbers) in mkiv begin at 0, instead of 1… well it is true that in Mathematics natural integers begin with 0, but not in books in those languages :-) Here is a minimal example: \setupdirections[bidi=global] \pagedir TRT \bodydir TRT \pardir TRT \textdir TRT \starttypescript[serif][arabic] \usetypescript[serif][fallback] \definefontsynonym [Serif][name:SimpleNaskhi] [features=arabic] \stoptypescript \starttypescript [arabic] \definetypeface [arabic][rm] [serif] [arabic] [default] \stoptypescript \usetypescript[arabic] \setupbodyfont[arabic,12pt] %%%%%%%%%%%%%%%%%% % heading numbers: \setuphead[section][conversion=persiannumerals] %,numberstyle={arabic}] %%%%%%%%%%%%%%%%%%% \starttext \dorecurse{5}{% \section{بخش}\par آزمایش } \stoptext Pardon me if I have been missing something already explained elsewhere. Best regards: OK