diff --git a/smt-cache/src/test/scala/org/bitlap/cache/CacheKeyBuilderSpec.scala b/smt-cache/src/test/scala/org/bitlap/cache/CacheKeyBuilderSpec.scala
index 217ed3e4..8c5aac39 100644
--- a/smt-cache/src/test/scala/org/bitlap/cache/CacheKeyBuilderSpec.scala
+++ b/smt-cache/src/test/scala/org/bitlap/cache/CacheKeyBuilderSpec.scala
@@ -1,3 +1,24 @@
+/*
+ * Copyright (c) 2022 bitlap
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 package org.bitlap.cache
 
 import org.scalatest.flatspec.AnyFlatSpec