diff --git a/net/wireguard/src/opnsense/mvc/app/models/OPNsense/Wireguard/Server.xml b/net/wireguard/src/opnsense/mvc/app/models/OPNsense/Wireguard/Server.xml
index c5ff1d90f..6a749c3d7 100644
--- a/net/wireguard/src/opnsense/mvc/app/models/OPNsense/Wireguard/Server.xml
+++ b/net/wireguard/src/opnsense/mvc/app/models/OPNsense/Wireguard/Server.xml
@@ -13,7 +13,7 @@
                     <default></default>
                     <Required>Y</Required>
                     <mask>/^([0-9a-zA-Z]){1,32}$/u</mask>
-                    <ValidationMessage>Should be a string between 1 and 32 characters. Allowed characters are 0-9a-zA-Z</ValidationMessage>
+                    <ValidationMessage>Should be a string between 1 and 32 characters. Allowed characters are 0-9, a-z, and A-Z</ValidationMessage>
                 </name>
                 <instance type="AutoNumberField">
                     <MinimumValue>0</MinimumValue>