No longer exists in Mk IV. Instead use
<texcodecontext mode=mkiv source=yes text=produces>\setuppapersize[A5] % When writing out the appendix title, place the name % APPENDIX before the appendix letter\setuplabeltext[appendix=APPENDIX~] % Add the APPENDIX label defined above to the % table of contents title.\setuplist[chapter][label=yes,width=9em]
\startbodymatter
TABLE OF CONTENTS
\placecontent
--------------------------------
\chapter{Regular chapter}
% ...
\startappendices
\chapter{Appendix: Some stuff}
% ...
\stopappendices
</texcodecontext>
== Example ==