diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index 7037a37be9..27ac579a01 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -28,6 +28,7 @@ public static class AuthenticationSchemes
 public static class FeatureFlagKeys
 {
     public const string SecretsManager = "secrets-manager";
+    public const string DisplayEuEnvironment = "display-eu-environment";
 
     public static List<string> GetAllKeys()
     {