ProductStoreCatalog and Productcatalog relationship

[BJ Freeman]

when I look at ProductStoreCatalog it shows
ProdCatalog   one   PS_CAT_CATALOG  prodCatalogId -> prodCatalogId
when I look at ProdCatalog  it shows
ProductStoreCatalog   many   prodCatalogId -> prodCatalogId

my gut says I should know this.
but my brain is not accepting this is correct.