Relationship in Canadian 1921 census - Servant

Hi, I hope someone can help.

I'm indexing a batch in the Canada—1921 Federal Census[MQKR-YVZ]. In it, there is a column "Relationship to head of household". This has a dropdown, and won't let me type anything.

I've only begun on my first sheet, and can see that the lack of "Servant" for values there is going to be a problem. There are 50 people on the page, and 4 are written into the record as "Servant" or "Domestic servant".

Should I just ignore this value (Ctrl-B)? The project instructions and field help don't mention this situation specifically.

Thanks in advance,

Sean