diff --git a/lib/inventory/build-inventory/interface.nix b/lib/inventory/build-inventory/interface.nix
index 9d5449447..8e18c6088 100644
--- a/lib/inventory/build-inventory/interface.nix
+++ b/lib/inventory/build-inventory/interface.nix
@@ -257,7 +257,7 @@ in
                 description = ''
                   !!! example "Predefined Tag"
 
-                      Will be added to all machines that set `machineClass = "darwin"`
+                      Will be added to all machines that set `machineClass = "nixos"`
 
                       ```nix
                       inventory.machines.machineA.tags = [ "nixos" ];