updat 6.12 to 6.13 get this message?

ok i upgraded the test drupal and i see this?
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User signatures no longer inherit comment input formats. Each user's signature now has its own associated format that can be selected on the user's account page. Existing signatures have been set to your site's default input format.
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and this is in a grey box:
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The following queries were executed
system module
Update #6051

* ALTER TABLE {users} ADD `signature_format` SMALLINT NOT NULL DEFAULT 0
* UPDATE {users} SET signature_format = 3

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now befori go and try upgrade the real drupal
i would like to ask if it is safe to do that or is the message etc. that i showed above gonna mess with things and did something go wrong?