diff --git a/nixos/doc/manual/release-notes/rl-2505.section.md b/nixos/doc/manual/release-notes/rl-2505.section.md
index 0f24a0cd4960..834066df59ac 100644
--- a/nixos/doc/manual/release-notes/rl-2505.section.md
+++ b/nixos/doc/manual/release-notes/rl-2505.section.md
@@ -290,6 +290,11 @@
 
   To get the necessary hash of the vendored dependencies, omit `hash`. The build will fail and tell you the correct value.
 
+- KDE Partition Manager `partitionmanager`'s support for ReiserFS is removed.
+  ReiserFS has not been actively maintained for many years. It has been marked as obsolete since Linux 6.6, and
+  [is removed](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c01f664e4ca210823b7594b50669bbd9b0a3c3b0)
+  in Linux 6.13.
+
 - `programs.fzf.keybindings` now supports the fish shell.
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
diff --git a/pkgs/applications/kde/partitionmanager/default.nix b/pkgs/applications/kde/partitionmanager/default.nix
index 35ede9df1eeb..049348429534 100644
--- a/pkgs/applications/kde/partitionmanager/default.nix
+++ b/pkgs/applications/kde/partitionmanager/default.nix
@@ -24,8 +24,6 @@
   jfsutils,
   nilfs-utils,
   ntfs3g,
-  reiser4progs,
-  reiserfsprogs,
   udftools,
   xfsprogs,
   zfs,
@@ -54,8 +52,7 @@ let
     jfsutils
     nilfs-utils
     ntfs3g
-    reiser4progs
-    reiserfsprogs
+    # reiser{4,fs}progs intentionally omitted due to filesystem removal from Linux.
     udftools
     xfsprogs
     zfs
@@ -98,7 +95,7 @@ mkDerivation {
     longDescription = ''
       KDE Partition Manager is a utility to help you manage the disks, partitions, and file systems on your computer.
       It allows you to easily create, copy, move, delete, back up, restore, and resize them without losing data.
-      It supports a large number of file systems, including ext2/3/4, btrfs, reiserfs, NTFS, FAT16/32, JFS, XFS and more.
+      It supports a large number of file systems, including ext2/3/4, btrfs, NTFS, FAT16/32, JFS, XFS and more.
 
       To install on NixOS, use the option `programs.partition-manager.enable = true`.
     '';
diff --git a/pkgs/kde/gear/kpmcore/default.nix b/pkgs/kde/gear/kpmcore/default.nix
index fcbfa4a730d6..7800962d6b3c 100644
--- a/pkgs/kde/gear/kpmcore/default.nix
+++ b/pkgs/kde/gear/kpmcore/default.nix
@@ -18,8 +18,6 @@
   jfsutils,
   nilfs-utils,
   ntfs3g,
-  reiser4progs,
-  reiserfsprogs,
   udftools,
   xfsprogs,
   zfs,
@@ -44,8 +42,7 @@ let
     jfsutils
     nilfs-utils
     ntfs3g
-    reiser4progs
-    reiserfsprogs
+    # reiser{4,fs}progs intentionally omitted due to filesystem removal from Linux.
     udftools
     xfsprogs
     zfs