diff --git a/crates/hir_ty/src/diagnostics/match_check/pat_util.rs b/crates/hir_ty/src/diagnostics/match_check/pat_util.rs
index eb0b07a5229..b89b4f2bfb7 100644
--- a/crates/hir_ty/src/diagnostics/match_check/pat_util.rs
+++ b/crates/hir_ty/src/diagnostics/match_check/pat_util.rs
@@ -1,3 +1,7 @@
+//! Pattern untilities.
+//!
+//! Originates from `rustc_hir::pat_util`
+
 use std::iter::{Enumerate, ExactSizeIterator};
 
 pub(crate) struct EnumerateAndAdjust<I> {