Harlowe - displaying a link to a passage if the player visited another passage

I'm trying to create a story where the outcomes change depending on which order the player explores a house. For example, if a player visits room X first, they will be unable to visit room Y, but they can still visit room Z.

Here's the code I'm trying to use:

(if: (history:) contains "Bathroom") [
[[Kitchen.]]
]
[[Bedroom.]]
[[Living room.]]

I get this error message:
"The (if:) command should be assigned to a variable or attached to a hook."

What am I doing wrong?