98ddk设置问题.急!!!

98ddk安装完后,要在config.sys 设置:
To increase the environment space:
Add the following command to your Config.sys file (or change the line already there):
shell=c:\\command.com /p /e:4096
但是我不管是怎末把shell=c:\\command.com /p /e:4096添加进config.sys中,在运行setenv d:\\98ddk free,总是出现空间不够.请问各位大虾.谢谢!!!其他设置还需注意什末?