diff --git a/tests/ui/macros/macro-in-or-pattern.rs b/tests/ui/macros/macro-in-or-pattern.rs
index 131139470f9f..c1dcd6efeaa4 100644
--- a/tests/ui/macros/macro-in-or-pattern.rs
+++ b/tests/ui/macros/macro-in-or-pattern.rs
@@ -1,3 +1,6 @@
+// Regression test for https://github.com/rust-lang/rust/issues/23891
+// Tests that a macro expanding to a pattern works correctly inside of or patterns
+
 //@ run-pass
 macro_rules! id {
     ($s: pat) => ($s);