diff --git a/tools/doc/Cantera.cfg.in b/tools/doc/Cantera.cfg.in
index 1cea2e1be..a657e5094 100755
--- a/tools/doc/Cantera.cfg.in
+++ b/tools/doc/Cantera.cfg.in
@@ -99,6 +99,7 @@ FILE_PATTERNS          = Kinetics.h Kinetics.cpp \
                          ctexceptions.h \
                          *.txt \
                          xml.h xml.cpp \
+                         ctml.h ctml.cpp ct2ctml.cpp \
                          clockWC.h clockWC.cpp \
                          equilibrium.h \
                          ThermoPhase.h  ThermoPhase.cpp \