Hi Hans, can you add a second (dummy) argument to \startbuffer. \setuvalue{\e!start\v!buffer}% {\begingroup % (3) \obeylines - \dosingleempty\buff_start} + \dodoubleempty\buff_start} -\def\buff_start[#1]% +\def\buff_start[#1][#2]% {\buff_start_indeed{}{#1}{\e!start\v!buffer}{\e!stop\v!buffer}} In the following example the space after the right bracket in “\startbuffer[test]” results in a empty first line in the buffer content and with a optional second argument this wouldn’t happen. \starttext \def\starttest{\grabbufferdata[test][starttest][stoptest]} \startbuffer[test] Text in a normal buffer. \stopbuffer “\getbufferdata[test]\removeunwantedspaces” \starttest Text in a customized buffer. \stoptest “\getbufferdata[test]\removeunwantedspaces” \stoptext Wolfgang