diff --git a/docs/todo.md b/docs/todo.md
index 19132e0..55d1038 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -17,9 +17,9 @@
 - [x] Hexadecimal, octal and binary literals
 - [x] Escape sequences
 - [x] Multiple return values
-- [ ] Type system
+- [x] Data structures
+- [x] Type system
 - [ ] Type operator `?`
-- [ ] Data structures
 - [ ] Slices
 - [ ] Floating-point arithmetic
 - [ ] Error handling
@@ -77,4 +77,4 @@
 
 - [x] Linux
 - [x] Mac
-- [ ] Windows
\ No newline at end of file
+- [x] Windows
\ No newline at end of file