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-rw-r--r--doc/manual/src/release-notes/rl-next.md3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md
index 26c7d2cce..a6b22dfa7 100644
--- a/doc/manual/src/release-notes/rl-next.md
+++ b/doc/manual/src/release-notes/rl-next.md
@@ -5,3 +5,6 @@
* `nix develop` now has a flag `--unpack` to run `unpackPhase`.
* Lists can now be compared lexicographically using the `<` operator.
+
+* New built-in function: `builtins.groupBy`, with the same functionality as
+ Nixpkgs' `lib.groupBy`, but faster.