diff --git a/README.md b/README.md
index 50bce4be77bdcebcba2d3f84f1c8dc02e8be2c02..9903dc219ced23700c05eed17776999fe5a73de2 100644
--- a/README.md
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@@ -2,6 +2,9 @@
 
 This plugin will monitor Cisco Firepower NAT translations.
 
+
+Tested with FTD 7.3.
+
 ---
 ### Download
 * [cisco_fw_nat_translations.mkp](https://thl-cmk.hopto.org/gitlab/checkmk/cisco/as//cisco_fw_nat_translations/-/raw/master/cisco_fw_nat_translations.mkp "Download the MKP file")