Import with No Duplicate Check for Individuals created Organisations too

did an import of individuals that I had already imported the Orgs for. I knew these had same names as other contacts but were in fact different people, so set import to be Individuals and No Duplicate Check

Import created (duplicate) records for the Organisations.

my file had Organisation Name and I had my mapping set to 'Employee of" "organisation name" - the organisations all already existed, hence my expectation that it would simple add the Individual and include the Relationship to the existing organisation.

Seems it doesn't check for an existing organisation as part of No Duplicate CHeck and therefore sets up new organisation.