diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
 # rustlings
 
-Oenkrons rustyfied zigling
\ No newline at end of file
+Oenkrons rustyfied zigling
+
+## ref links
+
+- [rustlingsrepo](https://github.com/rust-lang/rustlings/)
+- [rustlings](https://rustlings.rust-lang.org/)
+- [offical rustbook](https://doc.rust-lang.org/stable/book/)
+- [crate search](https://crates.io/)