diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # tiny-encrypt-rs
 
-Tiny encrypt for Rust
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+Tiny encrypt for Rust
+
+> Tiny encrypt spec see: https://git.hatter.ink/hatter/tiny-encrypt-java
+