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-rw-r--r--nixos/doc/manual/release-notes/rl-1803.xml8
1 files changed, 7 insertions, 1 deletions
diff --git a/nixos/doc/manual/release-notes/rl-1803.xml b/nixos/doc/manual/release-notes/rl-1803.xml
index 47522fe3cc92..6fa14b553862 100644
--- a/nixos/doc/manual/release-notes/rl-1803.xml
+++ b/nixos/doc/manual/release-notes/rl-1803.xml
@@ -55,7 +55,13 @@ following incompatible changes:</para>
 
 <itemizedlist>
   <listitem>
-    <para></para>
+    <para>
+      Dollar signs in options under <option>services.postfix</option> are
+      passed verbatim to Postfix, which will interpret them as the beginning of
+      a parameter expression. This was already true for string-valued options
+      in the previous release, but not for list-valued options. If you need to
+      pass literal dollar signs through Postfix, double them.
+    </para>
   </listitem>
 </itemizedlist>