diff --git a/src/opt.rs b/src/opt.rs
index 1f54a9408f..020f764e12 100644
--- a/src/opt.rs
+++ b/src/opt.rs
@@ -1,7 +1,8 @@
 use super::*;
 
 // todo:
-// - opts must conflict with arguments
+// - opts values must conflict with arguments: foo --bar BAR BAR:
+// - opt keys must conflict with other opts: foo --bar FOO --bar BAR:
 // - must account for opts in invocation
 // - opts should be able to be passed to dependencies
 // - document