[NTG-context] entries in registerentry

Hi, I don't understand the concept of entries in registerentry :o( Say, you have this example: \starttext \placeregister[index] \page page 1 \setregisterentry[index] [entries:1={eins}, entries:2={zwei}, entries:3={drei}, label=range] \page page 2 text \page page 3 \finishregisterentry[index][label=range] text \stoptext Why does only have entries:3 the index range "2-4", both entries:1 and 2 are emtpy? What should I write in order to have all of those entries referering to the same "2-4"? Best, Steffen