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-rw-r--r--nixos/doc/manual/release-notes/rl-1809.xml6
1 files changed, 6 insertions, 0 deletions
diff --git a/nixos/doc/manual/release-notes/rl-1809.xml b/nixos/doc/manual/release-notes/rl-1809.xml
index 51e77d24a74e..13b244e12f8c 100644
--- a/nixos/doc/manual/release-notes/rl-1809.xml
+++ b/nixos/doc/manual/release-notes/rl-1809.xml
@@ -127,6 +127,12 @@ $ nix-instantiate -E '(import <nixpkgsunstable> {}).gitFull'
      Make sure the key file is accessible to the daemon.
     </para>
    </listitem>
+   <listitem>
+    <para>
+      <varname>dockerTools.buildImage</varname> now uses <literal>null</literal> as default value for <varname>tag</varname>,
+      which indicates that the nix output hash will be used as tag.
+    </para>
+   </listitem>
   </itemizedlist>
  </section>