diff --git a/solutions/basic-types/functions.md b/solutions/basic-types/functions.md
index e01ddd3..294b5fb 100644
--- a/solutions/basic-types/functions.md
+++ b/solutions/basic-types/functions.md
@@ -92,6 +92,13 @@ fn never_return_fn() -> ! {
 }
 ```
 
+```rust
+// IMPLEMENT this function in THREE ways
+fn never_return_fn() -> ! {
+    todo!();
+}
+```
+
 ```rust
 // IMPLEMENT this function in THREE ways
 fn never_return_fn() -> ! {