It’s MODx, just FYI, and what do you mean by update MODx? Do you mean how do we commit changes to the source code, or how do you contribute changes to the source code, or do you mean upgrade from an older version of MODx on your site to a newer version? Your brevity in this case is a bit overwhelming...
Is there any procedure?
Thanks for the heads up!
BTW your signature to MODX development is broken.