Apache's mod_auth_digest hashes

I wanted to use Apache's bundled command "htdigest2" for managing Ayako's website's users, and I just found out that:

$ htdigest2 .htdigest realm user
Adding password for user in realm realm.
New password: [pass]
Re-type new password: [pass]

...is strictly equivalent to:

$ echo "user:realm:$( echo -n 'user:realm:pass' | md5sum )" >>.htdigest