commit - add1b745a56591b99ad089d0a965815784210dd0
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--- README.md
+++ README.md
@@ -4,10 +4,16 @@ yac8e is yet another Chip8 emulator, written in Rust.
 
 It will use [minifb](https://docs.rs/minifb/0.19.3/minifb/) for video and keyboard inputs.
 
+Documentation used:
+- http://devernay.free.fr/hacks/chip8/C8TECH10.HTM
+- https://github.com/mattmikolay/chip-8/wiki/Mastering-CHIP%E2%80%908
+- https://github.com/mattmikolay/chip-8/wiki/CHIP%E2%80%908-Technical-Reference
+
 ## TODO
 
 - [ ] [logging](https://github.com/borntyping/rust-simple_logger)
-- [ ] tests
+- [ ] tests ([reference](https://github.com/starrhorne/chip8-rust/blob/master/src/processor_test.rs))
 - [ ] [video output](https://docs.rs/minifb/0.19.3/minifb/struct.Window.html#method.update_with_buffer)
 - [ ] handle [keyboard inputs](https://docs.rs/minifb/0.19.3/minifb/struct.Window.html#method.get_keys_pressed)
 - [ ] proper [error handling](https://docs.rs/thiserror/1.0.26/thiserror/)
+- [ ] reformat instruction parsing (maybe like [this](https://github.com/starrhorne/chip8-rust/blob/master/src/processor.rs#L132))