you need to define unique constraint or unique index over FK columns and you'll get 1:1 line
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In addition to what Philip said you can also make the FK column(s) the PK for the child table which also results in a 1:1 relationship symbol. Is there something else oyu were looking for besides 1:1 or 1:M for the cardinality symbol?
Kent and Philip, thank you. That's exactly what I was looking for. "Correct" answer to Philip because it worked and he replied first. "Helpful" points to Kent.
And Kent, that's all I needed. Thank you for going further and asking.