Hi, With latest beta, the file below throws me the error given below the example file. I thought this was possible (see http://www.pragma-ade.com/general/manuals/cont-enp.pdf, (pdf)page 202). The error is not present if I remove the third problematic index entry. /Mikael % Example file \starttext This does not look right: \index{entry} \index[key]{entry} \index[infinifty]{$+\infty$} \placeindex \stoptext % Error message tex error > tex error on line 68 in file /home/mps/tmp/indexproblem.tex: ! Extra }, or forgotten $ <recently read> } <argument> ...mand {[internal expandable lua function call]}} } \firstofoneargument #1->#1 \doapplyregisterentrycommand ...extcommand {#2}}}} \dostoptagged \registerentry ...plyregisterentrycommand {#2}{#5} \fi \popcurrentregister l.68 }