diff --git a/README.md b/README.md
index 07ac7e1..6be08cb 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,9 @@
 ## Language features
 
 - [x] Math expressions
-  - [ ] Unary operators
-    - [ ] Negate `-X`
-  - [ ] Parentheses `(X+Y)*Z`
+  - [x] Unary operators
+    - [x] Negate `-X`
+  - [x] Parentheses `(X+Y)*Z`
   - [ ] Logical boolean operators
 - [ ] Variables
   - [ ] Declaration