diff --git a/.cvsignore b/.cvsignore
index 3ebf3fa..e47868b 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -3,3 +3,4 @@ net cube fifteen sixteen rect netslide nullgame
 *.exe *.obj *.o
 *.map *.rsp
 *notes
+HACKING