diff --git a/src/tools/miri/src/shims/unix/macos/foreign_items.rs b/src/tools/miri/src/shims/unix/macos/foreign_items.rs
index be4f2e66bab1..e968e7f4d628 100644
--- a/src/tools/miri/src/shims/unix/macos/foreign_items.rs
+++ b/src/tools/miri/src/shims/unix/macos/foreign_items.rs
@@ -122,8 +122,8 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 this.write_scalar(result, dest)?;
             }
 
-            // FIXME: add a test that directly calls this function.
             "mach_wait_until" => {
+                // FIXME: This does not have a direct test (#3179).
                 let [deadline] = this.check_shim_sig_lenient(abi, CanonAbi::C, link_name, args)?;
                 let result = this.mach_wait_until(deadline)?;
                 this.write_scalar(result, dest)?;