diff --git a/src/Core/Constants.cs b/src/Core/Constants.cs
index 4dc90d4b45..1dd9457a0a 100644
--- a/src/Core/Constants.cs
+++ b/src/Core/Constants.cs
@@ -105,6 +105,7 @@ public static class FeatureFlagKeys
     public const string VaultOnboarding = "vault-onboarding";
     public const string BrowserFilelessImport = "browser-fileless-import";
     public const string ReturnErrorOnExistingKeypair = "return-error-on-existing-keypair";
+    public const string UseTreeWalkerApiForPageDetailsCollection = "use-tree-walker-api-for-page-details-collection";
 
     /// <summary>
     /// Deprecated - never used, do not use. Will always default to false. Will be deleted as part of Flexible Collections cleanup