diff --git a/hosts/cap-apollo-n01/configuration.nix b/hosts/cap-apollo-n01/configuration.nix
index e305f7a..59198b1 100644
--- a/hosts/cap-apollo-n01/configuration.nix
+++ b/hosts/cap-apollo-n01/configuration.nix
@@ -23,4 +23,12 @@
   ];
 
   networking.hostName = "cap-apollo-n01";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-01/configuration.nix b/hosts/cap-clust-01/configuration.nix
index 9148a2e..1bd6f36 100644
--- a/hosts/cap-clust-01/configuration.nix
+++ b/hosts/cap-clust-01/configuration.nix
@@ -12,4 +12,12 @@
   ];
 
   networking.hostName = "cap-clust-01";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-02/configuration.nix b/hosts/cap-clust-02/configuration.nix
index 502faee..cc1d98d 100644
--- a/hosts/cap-clust-02/configuration.nix
+++ b/hosts/cap-clust-02/configuration.nix
@@ -12,4 +12,12 @@
   ];
 
   networking.hostName = "cap-clust-02";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-03/configuration.nix b/hosts/cap-clust-03/configuration.nix
index 118cb0c..fbf66b3 100644
--- a/hosts/cap-clust-03/configuration.nix
+++ b/hosts/cap-clust-03/configuration.nix
@@ -12,4 +12,12 @@
   ];
 
   networking.hostName = "cap-clust-03";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-04/configuration.nix b/hosts/cap-clust-04/configuration.nix
index 268cabe..a93390b 100644
--- a/hosts/cap-clust-04/configuration.nix
+++ b/hosts/cap-clust-04/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-04";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-05/configuration.nix b/hosts/cap-clust-05/configuration.nix
index aa49857..4e4f9ed 100644
--- a/hosts/cap-clust-05/configuration.nix
+++ b/hosts/cap-clust-05/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-05";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-06/configuration.nix b/hosts/cap-clust-06/configuration.nix
index 46f8569..bba1239 100644
--- a/hosts/cap-clust-06/configuration.nix
+++ b/hosts/cap-clust-06/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-06";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-07/configuration.nix b/hosts/cap-clust-07/configuration.nix
index 4956ce5..5404ad1 100644
--- a/hosts/cap-clust-07/configuration.nix
+++ b/hosts/cap-clust-07/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-07";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-08/configuration.nix b/hosts/cap-clust-08/configuration.nix
index e120484..518bf9a 100644
--- a/hosts/cap-clust-08/configuration.nix
+++ b/hosts/cap-clust-08/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-08";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }
diff --git a/hosts/cap-clust-09/configuration.nix b/hosts/cap-clust-09/configuration.nix
index e2c6c14..27d9c6f 100644
--- a/hosts/cap-clust-09/configuration.nix
+++ b/hosts/cap-clust-09/configuration.nix
@@ -9,4 +9,12 @@
   ];
 
   networking.hostName = "cap-clust-09";
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "25.11"; # Did you read the comment?
 }