diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1,6 +1,8 @@
 # marisa-rs
 
-Safe Rust wrapper for the [marisa-trie](https://github.com/s-yata/marisa-trie) C++ library.
+Safe Rust wrapper for the [marisa-trie](https://github.com/s-yata/marisa-trie) C++ library. 
+
+（※ちなみに、Rustだから雰囲気でSafeとか書いたものの全然Safeではない。バリバリunsafe使用である）
 
 marisa-trie is a static and space-efficient trie data structure library. This crate provides safe Rust bindings to the C++ library.