diff --git a/tests/ui/test-not-send.stderr b/tests/ui/test-not-send.stderr
index c720f378..b067e570 100644
--- a/tests/ui/test-not-send.stderr
+++ b/tests/ui/test-not-send.stderr
@@ -5,6 +5,7 @@ error[E0277]: `proc_macro::Span` cannot be sent between threads safely
   |                     ^^^^ `proc_macro::Span` cannot be sent between threads safely
   |
   = help: within `Span`, the trait `Send` is not implemented for `proc_macro::Span`
+  = note: consider using `std::sync::Arc<proc_macro::Span>`; for more information visit <https://doc.rust-lang.org/book/ch16-03-shared-state.html>
 note: required because it appears within the type `Span`
  --> $WORKSPACE/src/wrapper.rs
   |
@@ -28,6 +29,7 @@ error[E0277]: `Rc<()>` cannot be sent between threads safely
   |                     ^^^^ `Rc<()>` cannot be sent between threads safely
   |
   = help: within `Span`, the trait `Send` is not implemented for `Rc<()>`
+  = note: use `std::sync::Arc` instead of `std::rc::Rc`
 note: required because it appears within the type `ProcMacroAutoTraits`
  --> $WORKSPACE/src/marker.rs
   |