@Size(min, max) but not required

Hi In my spring webapp I have a password variable which I want to be at least 0 characters or more than 6 and less than 20. I know that there is annotation: @Size(min=6, max=20) but I have no idea how to add possibility that password can be 0 characters. Will somebody help me with this?
You want either empty password or 6 to 20 chars lenght, correct? Are you using hibernate-validator in Spring MVC Controller?

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