diff --git a/README.md b/README.md
index 13b939d47e75aed2be5cf1bdbefc665e332c1b2e..b6d5751ba2238b09fc3180850e3175f8756070ee 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ Create the vascularization
 mkdir /Output/no_tumor
 mkdir /Output/tumor
 cd /Output/no_tumor
-/build/Vascularization.out -x100 -y100 -z1 -V. -Irandom0 -R100 -X/Output/no_tumor/no_tumor.xml
+/build/Vascularization.out -x100 -y100 -z1 -V. -p0.1 -Irandom0 -R100 -X/Output/no_tumor/no_tumor.xml
 
 cd /Output/tumor
 /build/Vascularization.out -V/Output/no_tumor/no_tumor.xml -R10 -r7 -Tr15 -Tx25 -Ty25 -Tc10 -N -R100 -X/Output/tumor/tumor.xml