diff --git a/doc/manual/release-notes.xml b/doc/manual/release-notes.xml
index f993328523..9bfa169ac5 100644
--- a/doc/manual/release-notes.xml
+++ b/doc/manual/release-notes.xml
@@ -173,6 +173,16 @@ $ nix-instantiate --eval '<nixos>' -A 'config.systemd.units."nscd.service".te
     1G</literal> will free up to 1 gigabyte of disk space.</para>
   </listitem>
 
+  <listitem>
+    <para><command>nix-collect-garbage</command> has a new flag
+    <option>--delete-older-than</option>
+    <replaceable>N</replaceable><literal>d</literal>, which deletes
+    all user environment generations older than
+    <replaceable>N</replaceable> days.  Likewise, <command>nix-env
+    --delete-generations</command> accepts a
+    <replaceable>N</replaceable><literal>d</literal> age limit.</para>
+  </listitem>
+
   <listitem>
     <para>Nix now heuristically detects whether a build failure was
     due to a disk-full condition. In that case, the build is not
@@ -238,6 +248,10 @@ $ bash &lt;(curl https://nixos.org/nix/install)
 
 </itemizedlist>
 
+<para>This release has contributions from Danny Wilson, Domen Kožar,
+Eelco Dolstra, Ian-Woo Kim, Ludovic Courtès, Maxim Ivanov, Petr
+Rockai, Ricardo M. Correia and Shea Levy.</para>
+
 </section>