diff --git a/README.md b/README.md
index 67047db..725bc3b 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ Fruently
 [Documentation](http://cosmo0920.github.io/fruently/fruently/index.html)
 
 A yet another Fluentd logger for Rust.
+Any version newer than Rust 1.18.0 is supported.
 
 ##### Note