diff --git a/tests/run-pass/aux_test.rs b/tests/run-pass/aux_test.rs
index 1b1dbaa68387..dd46c638a2af 100644
--- a/tests/run-pass/aux_test.rs
+++ b/tests/run-pass/aux_test.rs
@@ -1,4 +1,5 @@
 // aux-build:dep.rs
+// This ignores the test against rustc, but runs it against miri:
 // ignore-cross-compile
 
 extern crate dep;
diff --git a/tests/run-pass/u128.rs b/tests/run-pass/u128.rs
index bd68157e4bc2..4fe40a9694d4 100644
--- a/tests/run-pass/u128.rs
+++ b/tests/run-pass/u128.rs
@@ -8,11 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-stage0
+// This disables the test completely:
 // ignore-stage1
 
-// ignore-emscripten
-
 #![feature(i128_type)]
 
 fn b<T>(t: T) -> T { t }