diff --git a/README.md b/README.md
index 3b800090566376d1202704c62545b0814ed5eb5c..a8596340d18881f2f1287bf988f4e1523b68669d 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ You can view installation guide guide on [3ilson.org YouTube Channel ](https://w
 
 ### Prerequisites 
 - Ubuntu Server v18.04+
-- pfSense v2.4.4+
+- pfSense v2.4.4+ or OPNsense 19.1.1+
 
 # Preparation