diff --git a/src/runtimes/ruby.rs b/src/runtimes/ruby.rs
index a0b34b5..3b6d43b 100644
--- a/src/runtimes/ruby.rs
+++ b/src/runtimes/ruby.rs
@@ -1,3 +1,4 @@
+// TODO: maybe make all runtime engines not send and spawn threads for them like Ruby
 // TODO: make sure ruby is statically linked
 use std::{
     collections::HashMap,