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-rw-r--r--nixos/modules/virtualisation/azure-image.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/nixos/modules/virtualisation/azure-image.nix b/nixos/modules/virtualisation/azure-image.nix
index 60fed3222ef..03dd3c05130 100644
--- a/nixos/modules/virtualisation/azure-image.nix
+++ b/nixos/modules/virtualisation/azure-image.nix
@@ -9,8 +9,9 @@ in
 
   options = {
     virtualisation.azureImage.diskSize = mkOption {
-      type = with types; int;
-      default = 2048;
+      type = with types; either (enum [ "auto" ]) int;
+      default = "auto";
+      example = 2048;
       description = ''
         Size of disk image. Unit is MB.
       '';