mongodb/docs — pull request #795 by danilobellini (2013-03-28 06:11:48+00:00)
Title: Just an example using $unset

There's a MongoDB solution for changing collections that resembles SQL's ALTER TABLE ... DROP COLUMN. This pull request just changed the MongoDB documentation to give that solution (with $unset) as an example, instead of just repeating the message from the ALTER TABLE ... ADD.