diff --git a/src/TeamsISO.Engine.NdiInterop/NdiVersion.cs b/src/TeamsISO.Engine.NdiInterop/NdiVersion.cs
index 4d7c896..b2d1d2b 100644
--- a/src/TeamsISO.Engine.NdiInterop/NdiVersion.cs
+++ b/src/TeamsISO.Engine.NdiInterop/NdiVersion.cs
@@ -12,9 +12,14 @@ public static class NdiVersion
     public const string SdkFamily = "NDI 6";
 
     /// <summary>
-    /// Prefix of the runtime version string we expect (NDI runtime reports e.g.
-    /// "NDI SDK for Windows v6.0.1.0"). Any major change of the leading "v6" is treated
-    /// as a mismatch.
+    /// Prefix of the runtime version banner we expect. The shipping NDI 6 runtime
+    /// reports its version as a build banner of the form
+    ///   "NDI SDK WIN64 13:07:00 Jun  2 2025 6.2.0.3"
+    /// where the architecture token ("WIN64" / "WIN32") is stable across patch
+    /// releases and confirms we loaded the binary the engine P/Invokes against
+    /// (Processing.NDI.Lib.x64.dll). The trailing four-part token is the SDK's
+    /// numeric version. The probe checks this prefix; a stricter probe could
+    /// additionally enforce the leading "6." in the trailing version token.
     /// </summary>
-    public const string ExpectedRuntimeVersionPrefix = "NDI SDK for Windows v6";
+    public const string ExpectedRuntimeVersionPrefix = "NDI SDK WIN64";
 }