diff --git a/src/test/ui/pattern/issue-53820-slice-pattern-large-array.rs b/src/test/ui/pattern/issue-53820-slice-pattern-large-array.rs
index 38c830e4d69bb..c910cded96be4 100644
--- a/src/test/ui/pattern/issue-53820-slice-pattern-large-array.rs
+++ b/src/test/ui/pattern/issue-53820-slice-pattern-large-array.rs
@@ -1,4 +1,7 @@
 // check-pass
+
+// This used to cause a stack overflow in the compiler.
+
 #![feature(slice_patterns)]
 
 fn main() {