The "-glob" option of ktadd of kadmin

I'm studying some kerberos today, making test with ktadd I found a "mysterious" -glob option. What does it mean -glob? I see.. Usage: ktadd [-k[eytab] keytab] [-q] [-e keysaltlist] [principal | -glob princ-exp] [...] -k is the keytab where to extract keys -q is quiet -e is the ciphers/keysaltlist to use -glob..global options?