[NTG-context] hyphenation exceptions?

Has something happened to hyphenation? The following does not work \language[nl] \startexceptions[nl] Am-ster-dam \stopexceptions Neither does \hyphenation{Am-ster-dam} Only in the context-source Am\-ster\-dam is working. How to load a series of hyphenation exceptions instead of explicitely spelling out the breakpoints in the source? Hans van der Meer