hp uft : how to change svn commit message?

Hi,

I use SVN as version control system in my project.

In HP UFT 12.51 I can do some simple action into HP UFT studio, it's really usefull (like commit, revert, update, etc)

But when I commit from HP UFT I can't change default message "HP UFT Commit", so my commits are uninformative. 

How I can change default message?

Thank you