Overload missing 'terrain' @ room

I think the 'terrain' entry is missing in the room.js.

I added this to my local file:
    /**
     * plain, wall or swamp
     *
     * @terrain {PLAIN|WALL|SWAMP}
     */
    terrain: 'plain',

I'am not sure if I fixed this right, I am not familiair with this, but it works for me. 
Now my IDE is happy :-)

Ty for this Screeps Autocomplete repo.