This is a list of changes to pphqq.f since June 2000: June 23 2015: version 1.10: - Link to LHAPDF implemented - input alpha_s(M_Z) instead of Lambda_n September 12 2007: - Link to MRST2001 PDFs corrected due to errorneous interchange of u and d. (thanks to M. Ciccolini) April 12 2005: - Link to CTEQ6 and MRST2001 PDFs (NGROUP = -1: CTEQ6 -2: MRST2001) June 2 2003: - Reading in the mu parameter which was missing! June 23 2000: - Insertion of missing scale variations for scales in units of Q (thanks to S. Dawson)