diff --git a/src/kmerge_impl.rs b/src/kmerge_impl.rs
index 4660caf07..0be3840a1 100644
--- a/src/kmerge_impl.rs
+++ b/src/kmerge_impl.rs
@@ -153,7 +153,7 @@ where
 ///
 /// See [`.kmerge_by()`](crate::Itertools::kmerge_by) for more
 /// information.
-#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
+#[must_use = "this iterator adaptor is not lazy but does nearly nothing unless consumed"]
 pub struct KMergeBy<I, F>
 where
     I: Iterator,
diff --git a/tests/laziness.rs b/tests/laziness.rs
index f936decde..7575e3786 100644
--- a/tests/laziness.rs
+++ b/tests/laziness.rs
@@ -143,11 +143,11 @@ must_use_tests! {
         let _ = Panicking.merge_join_by(Panicking, |_, _| true);
         let _ = Panicking.merge_join_by(Panicking, Ord::cmp);
     }
-    #[ignore]
+    #[should_panic]
     kmerge {
         let _ = Panicking.map(|_| Panicking).kmerge();
     }
-    #[ignore]
+    #[should_panic]
     kmerge_by {
         let _ = Panicking.map(|_| Panicking).kmerge_by(|_, _| true);
     }