diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index 1a7cb482ec58..b8e32406a6e4 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -322,6 +322,9 @@ static void clk_orphan_transparent_single_parent_mux_test_exit(struct kunit *tes
 /*
  * Test that a mux-only clock, with an initial rate within a range,
  * will still have the same rate after the range has been enforced.
+ *
+ * See:
+ * https://lore.kernel.org/linux-clk/7720158d-10a7-a17b-73a4-a8615c9c6d5c@collabora.com/
  */
 static void clk_test_orphan_transparent_parent_mux_set_range(struct kunit *test)
 {