diff --git a/releasenotes.md b/releasenotes.md
index 292a2963c..adff8fff9 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -36,6 +36,7 @@
 - Updated Base32 API.
 - Add `file::save`.
 - Add `memcpy` / `memset` / `memcmp` to nolibc.
+- Add `sort::quickselect` to find the k-th smallest element in an unordered list.
 
 ## 0.6.4 Change list