diff --git a/tools/doc/Cantera.cfg.in b/tools/doc/Cantera.cfg.in
index 3fbfcc066..016532e7d 100755
--- a/tools/doc/Cantera.cfg.in
+++ b/tools/doc/Cantera.cfg.in
@@ -149,7 +149,8 @@ FILE_PATTERNS          = Kinetics.h Kinetics.cpp \
                          Nasa9Poly1.h Nasa9Poly1.cpp \
                          Nasa9PolyMultiTempRegion.h Nasa9PolyMultiTempRegion.cpp \
                          vcs_internal.h vcs_defs.h \
-                         vcs_MultiPhaseEquil.h vcs_MultiPhaseEquil.cpp
+                         vcs_MultiPhaseEquil.h vcs_MultiPhaseEquil.cpp \
+                         FalloffFactory.h FalloffFactory.cpp
 RECURSIVE              = NO
 EXCLUDE                = CVS examples  converters zeroD
 EXCLUDE_SYMLINKS       = NO