diff --git a/docs/installation.adoc b/docs/installation.adoc
index 7b2ecd43..70d8c6f1 100644
--- a/docs/installation.adoc
+++ b/docs/installation.adoc
@@ -155,6 +155,10 @@ users.users.eve.isNormalUser = true;
 home-manager.users.eve = { pkgs, ... }: {
   home.packages = [ pkgs.atool pkgs.httpie ];
   programs.bash.enable = true;
+
+  # The state version is required and should stay at the version you
+  # originally installed.
+  system.stateVersion = "23.05";
 };
 ----
 
@@ -278,6 +282,10 @@ users.users.eve = {
 home-manager.users.eve = { pkgs, ... }: {
   home.packages = [ pkgs.atool pkgs.httpie ];
   programs.bash.enable = true;
+
+  # The state version is required and should stay at the version you
+  # originally installed.
+  system.stateVersion = "23.05";
 };
 ----