Regulatory component of the SET1 complex implicated in the tethering of this complex to transcriptional start sites of active genes. Facilitates histone H3 'Lys-4' methylation (H3K4me) via recruitment of the SETD1A or SETD1B to the 'Ser-5' phosphorylated C-terminal domain (CTD) of RNA polymerase II large subunit (POLR2A). Part of a transcription termination checkpoint that promotes transcription termination of long non-coding RNAs (lncRNAs). Component of the SET1 complex. Associates with chromatin (By similarity). Recruited at sites of high RNA polymerase II occupancy (By similarity). Belongs to the WD repeat SWD2 family.