Add release notes entry for #5149

NixOS · Dec 13, 2021 · 3f417c8 · 3f417c8
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diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md
@@ -1,5 +1,9 @@
 # Release 2.5 (2021-XX-XX)
 
+* The garbage collector no longer blocks new builds, so the message
+  `waiting for the big garbage collector lock...` is a thing of the
+  past.
+
 * Binary cache stores now have a setting `compression-level`.
 
 * `nix develop` now has a flag `--unpack` to run `unpackPhase`.