diff --git a/Cantera/src/thermo/.cvsignore b/Cantera/src/thermo/.cvsignore
index adadf2453..248566acf 100644
--- a/Cantera/src/thermo/.cvsignore
+++ b/Cantera/src/thermo/.cvsignore
@@ -2,3 +2,9 @@
 .depends
 Makefile
 SunWS_cache
+HKFT_PDSS.cpp
+HKFT_PDSS.h
+ PDSS_Behavior.txt
+ TODO.txt
+WaterEps.cpp
+WaterEps.h