diff --git a/ZUC-with-AESENCLAST.md b/ZUC-with-AESENCLAST.md
index d4d84fd..3f89ce1 100644
--- a/ZUC-with-AESENCLAST.md
+++ b/ZUC-with-AESENCLAST.md
@@ -1 +1,3 @@
+This is the pure golang code to study ZUC implementation with AESENCLAST instruction.
+
 [zuc sbox with aesni](https://gist.github.com/emmansun/ae4677d71c75ff8407d5f5b3a884f5d2)
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