diff --git a/src/JWT/JWT.cs b/src/JWT/JWT.cs
index 9fb449737..e6f87d13b 100644
--- a/src/JWT/JWT.cs
+++ b/src/JWT/JWT.cs
@@ -239,7 +239,10 @@ public static void Verify(string payloadJson, string decodedCrypto, string decod
         {
             if (decodedCrypto != decodedSignature)
             {
-	            throw new SignatureVerificationException("Invalid signature");
+	            var signatureVerificationException = new SignatureVerificationException("Invalid signature");
+				signatureVerificationException.Data.Add("Expected", decodedCrypto);
+				signatureVerificationException.Data.Add("Received", decodedSignature);
+	            throw signatureVerificationException;
             }
 
             // verify exp claim https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.4