diff --git a/doc/release-notes/rl-2611.section.md b/doc/release-notes/rl-2611.section.md
index 6f2246688d21..b2ed8a86318b 100644
--- a/doc/release-notes/rl-2611.section.md
+++ b/doc/release-notes/rl-2611.section.md
@@ -4,7 +4,17 @@
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
-- Create the first release note entry in this section!
+- The {file}`nixexprs.tar.xz` tarball will be discontinued together with Nixpkgs
+  27.05 after 2027-12-31. Migrate to the {file}`nixexprs.tar.zst` tarball
+  instead.
+
+  This affects for example users who pull Nixpkgs as a flake input from
+  https://channels.nixos.org:
+
+  ```diff
+  -nixpkgs.url = "https://channels.nixos.org/nixos-26.05/nixexprs.tar.xz";
+  +nixpkgs.url = "https://channels.nixos.org/nixos-26.05/nixexprs.tar.zst";
+  ```
 
 ## Backward Incompatibilities {#sec-nixpkgs-release-26.11-incompatibilities}
 
diff --git a/nixos/doc/manual/release-notes/rl-2611.section.md b/nixos/doc/manual/release-notes/rl-2611.section.md
index 4f3a9d0d9a80..1539b800fbcd 100644
--- a/nixos/doc/manual/release-notes/rl-2611.section.md
+++ b/nixos/doc/manual/release-notes/rl-2611.section.md
@@ -4,7 +4,17 @@
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
-- Create the first release note entry in this section!
+- The {file}`nixexprs.tar.xz` tarball will be discontinued together with Nixpkgs
+  27.05 after 2027-12-31. Migrate to the {file}`nixexprs.tar.zst` tarball
+  instead.
+
+  This affects for example users who pull Nixpkgs as a flake input from
+  https://channels.nixos.org:
+
+  ```diff
+  -nixpkgs.url = "https://channels.nixos.org/nixos-26.05/nixexprs.tar.xz";
+  +nixpkgs.url = "https://channels.nixos.org/nixos-26.05/nixexprs.tar.zst";
+  ```
 
 ## New Modules {#sec-release-26.11-new-modules}