diff --git a/README.md b/README.md
index d977682..f9f9c40 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,6 @@
 ## To Do
 - [ ] Implement basic Redis commands
     - [x] Implement `Set` using hash table
-    - [ ] Implement `Sorted Set` using red black tree
+    - [x] Implement `Sorted Set` using red black tree
 - [ ] Add generics to store
 - [ ] Implement hard-disk persistence