diff --git a/src/main/kotlin/biz/cdkey.kt b/src/main/kotlin/biz/cdkey.kt
index 2197548..a2fdb0e 100644
--- a/src/main/kotlin/biz/cdkey.kt
+++ b/src/main/kotlin/biz/cdkey.kt
@@ -107,7 +107,7 @@ fun validateCDK(params: ValidateParams): Resp {
             }
             .iterator()
         if (!qr.hasNext()) {
-            throw ServiceException("invalid cdk")
+            throw ServiceException("Please confirm that you have entered the correct cdkey")
         }
         qr.next().run {
             ValidTuple(