langium boolean properties confused

[zrwsmd]

for this part(https://langium.org/docs/grammar-language/),i am a little confused:

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if i want to set remote to true,i might write like employee smith remote,but if i want to set remote to false,how should i write it,it seems that remote keyword is necessary

[msujew]

@zrwsmd Langium's boolean properties are automatically assigned to false if they're not true. No need for any action.

[zrwsmd]

so for below example,how do i write it,it seems that if i write 'employee smith',there is a parse error
write ‘'employee smith remote' indicate set remote property to true,am i right?

[msujew]

Is the ? at the end of the assignment missing? As the documentation explains, the ? cardinality makes the remote part optional.

[zrwsmd]

oh,gosh,i remember i add the last ?, but .langium file seem did not add it,very thanks