This study examined whether providing knowledge about linguistic differences between Dutch and Frisian could improve Dutch speakers' receptive skills in Frisian. 23 Dutch students participated in either an intervention teaching Frisian phonological rules or a control group. Both groups took pre- and post-tests of Frisian text and word comprehension. The intervention did not significantly improve scores over the control. However, the intervention group viewed Frisian as more beautiful after the study. The authors concluded the intervention was not effective for improving receptive multilingualism and discussed factors like language closeness and duration.