Backslash prepended to underscores in comments

I have a type alias definition in the following form:

{-| represents a diary, as returned by the endpoint api/get_diary.
 -}

type alias Diary =
     { notes : String
     , pages : Int     
     }

Elm-format converts the comment to the following:

{-| represents a diary, as returned by the endpoint api/get\_diary.
 -}

I understand the usefulness of such rule in the code - but it should be ignored in comments.