diff --git a/README.md b/README.md
index 2e5e22c..1eafca8 100644
--- a/README.md
+++ b/README.md
@@ -116,9 +116,11 @@ This is what generates expressions from tokens.
 - [x] Hexadecimal, octal and binary literals
 - [x] Escape sequences
 - [x] Multiple return values
-- [ ] Data structures
 - [ ] Type system
-- [ ] Type operator: `|` (`User | Error`)
+- [ ] Type operator `?`
+- [ ] Data structures
+- [ ] Slices
+- [ ] Floating-point arithmetic
 - [ ] Error handling
 - [ ] Threading library
 - [ ] Self-hosted compiler