'git format-patch <ref> --summary' seems to be turning off the stat

The documentation for "--summary" option in the format-patch Doc states, --summary Output a condensed summary of extended header information such as creations, renames and mode changes. It doesn't state anything about turning of the stat. Why does the stat get turned off when "--summary" option is used along with "git format-patch" ? Note: I do see that "--summary" is a diff-option but does that mean we should't be printing stat information in the patch when the user didn't mention "--no-stat"? Yeah, "git format-patch <ref> --summary --stat" does bring back the stat. --- Kaartic