diff --git a/src/bytes_mut.rs b/src/bytes_mut.rs
index 960d8cad3..03ea69db2 100644
--- a/src/bytes_mut.rs
+++ b/src/bytes_mut.rs
@@ -847,6 +847,7 @@ impl BytesMut {
     /// split.clear();
     /// assert_eq!(true, split.try_reclaim());
     /// ```
+    #[must_use = "consider BytesMut::reserve if you need a specific capacity"]
     pub fn try_reclaim(&mut self) -> bool {
         if !self.is_empty() {
             return false;