diff --git a/tools/doc/Cantera.cfg.in b/tools/doc/Cantera.cfg.in
index df7bfbb49..e9d8ce651 100755
--- a/tools/doc/Cantera.cfg.in
+++ b/tools/doc/Cantera.cfg.in
@@ -123,6 +123,7 @@ FILE_PATTERNS          = Kinetics.h Kinetics.cpp \
                          IdealSolidSolnPhase.h   IdealSolidSolnPhase.cpp \
                          StoichSubstanceSSTP.h   StoichSubstanceSSTP.cpp \
                          DebyeHuckel.h           DebyeHuckel.cpp  \
+                         HMWSoln.h HMWSoln.cpp HMWSoln_input.cpp \
                          ConstDensityThermo.h ConstDensityThermo.cpp \
                          WaterPropsIAPWSphi.h  WaterPropsIAPWSphi.cpp \
                          WaterPropsIAPWS.h  WaterPropsIAPWS.cpp \