diff --git a/todo.yaml b/todo.yaml
index 2213cdf..4aafe01 100755
--- a/todo.yaml
+++ b/todo.yaml
@@ -1,4 +1,5 @@
 todo:
+- https://crates.io/crates/handlebars
 - learn rust; https://rust-book.cs.brown.edu/
 - gui keyboard; https://docs.rs/iced/latest/iced/keyboard/index.html
 - input gamepad; https://docs.rs/gilrs/latest/gilrs/