diff --git a/src/runtimes/ruby.rs b/src/runtimes/ruby.rs
index 5123ec6..d12609d 100644
--- a/src/runtimes/ruby.rs
+++ b/src/runtimes/ruby.rs
@@ -1,9 +1,7 @@
-// TODO: maybe make all runtime engines not send and spawn threads for them like Ruby
+// TODO: maybe make all runtime engines not send and spawn threads for them like Ruby, benchmark?
 // TODO: make sure ruby is statically linked
 // TODO: add tests for every runtime for return value
-// TODO: unwinding https://doc.rust-lang.org/nomicon/ffi.html#variadic-functions
 // TODO: maybe unify api and call non thread methods non_send
-// TODO: use ruby arena to rewind state
 
 use std::{
     collections::HashMap,