diff --git a/src/test/ui/specialization/issue-39618.rs b/src/test/ui/specialization/issue-39618.rs
index 78894a56997..20e81e4359b 100644
--- a/src/test/ui/specialization/issue-39618.rs
+++ b/src/test/ui/specialization/issue-39618.rs
@@ -1,4 +1,7 @@
 // Regression test for #39618, shouldn't crash.
+// FIXME(JohnTitor): Centril pointed out this looks suspicions, we should revisit here.
+// More context: https://github.com/rust-lang/rust/pull/69192#discussion_r379846796
+
 // check-pass
 
 #![feature(specialization)]