diff --git a/example/msg.cfg b/example/msg.cfg
index 3b37053..3607c92 100755
--- a/example/msg.cfg
+++ b/example/msg.cfg
@@ -131,6 +131,8 @@ recRate= 0
 # breakpoints; less than one and it will introduce fewer. (default 1)
 rfac=.000001
 
+# Minimum difference between posterior probs to thin (summaryPlots.R)
+difffac=0.01
 # Min fraction of missing data (summaryPlots.R)
 pnathresh=.03