Why is `-list` used in the following keytool command?

Why is `-list` used in the following keytool command?:

In the Lineage OS documentation (yes, it is related to Linux) theres:

All official builds from LineageOS are signed with our private keys. You can verify a build has been signed with our keys by running: keytool -list -printcert -jarfile some-lineage-rom.zip

What role does -list play here? I get the same result omitting -list
From man keytool :

-list: Prints to stdout the contents of the keystore entry identified by alias. If no alias is specified, then the contents of the entire keystore are printed. This command by default prints the SHA1 fingerprint of a certificate 

What does -list take as parameters?

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