Django-Grappelli...... customize the admin/base_site.html

[bruce]

Dear All,

Before Grappelli is installed, I can simply create a customized admin/base_site.html to override the default admin/base_site.html. 

After the Grappelli is installed, I failed to do it.  

Is there any way I can customize the base_site.html file? or, 

is there any links for additional knowledge I need to read? 

Thanks!!

Bruce