diff --git a/README.md b/README.md
index d6beb84..bad59d7 100644
--- a/README.md
+++ b/README.md
@@ -136,7 +136,7 @@ Planned exercises:
 * [x] Numeric types (integers, floats)
 * [x] Labelled blocks and loops
 * [x] Loops as expressions
-* [ ] Builtins
+* [x] Builtins
 * [ ] Comptime (!)
 * [ ] Inline loops
 * [ ] Anonymous structs