[R] how to change variable names in corrgram diagonal

[maxbre]

given this example

library(corrgram)

corrgram(mtcars[2:6], order=TRUE, upper.panel=panel.conf,
         lower.panel=panel.pie,
         diag.panel=panel.minmax,
         text.panel=panel.txt)      


how can I change  the variable names in main diagonal? 
(so that I can put more informative names of variables)

I think to understand that this should be done by modifing the panel.txt
function but for some reasons I'm not able to put that into practice
any help for this

thank you



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