Dear ConTeXters, there are 3 topics dealing with register (index): 1. [Spurious space] There are entries like \registerpage{index}{,}{5}{2--1-1-0-1-0-0-0--1}{2} in a *.tuo file. Since the definition (core-reg.tex) \def\dosetpageregisterpage#1#2#3#4#5#6% {\doifreglevelelse[#5]% {\dodosetpageregisterpage{#1}{#2}{#3}{#4}{#5}{#6}}% {}} there will be a spurious space between page number like Entry 23 , 67 instead of Entry 23, 67 Solution: \def\dosetpageregisterpage#1#2#3#4#5#6% {\doifreglevelelse[#5]% {\dodosetpageregisterpage{#1}{#2}{#3}{#4}{#5}{#6}}% {}\ignorespaces} Test file: -------------- \starttext Text\index{test}. \page[yes] Paragraph\index{test}. \placeindex \stoptext -------------- 2. [feature request] Current register implementation enable upto three entry level (\index{level 1+level 2+level 3}). My custommer require 4 levels. Please could the entry number be extended? 3. [not important, just for info] Formating of the register entries is not much user friendly. See \hangindent1em in a following definition: \def\dosetpageregisterentrya#1#2% {\flushseenregisterpage \edef\currententrylevel{1}% \global\let\c!entryb\relax \global\let\c!entryc\relax \gdef\c!entrya {\iffirstregisterentry\else\endgraf\fi % new \global\firstregisterpagetrue \hangindent1em\noindent\c!entryreference \dohandlepageregisterentry{#1}{#2}% \global\firstregisterentryfalse \global\firstsubentrytrue \global\firstsubsubentrytrue}} So, when one want the change formating he has to redefine this definition. It is against a ConTeXt spirit. Best Vit