diff --git a/docs/create-image-and-azure-resources.md b/docs/create-image-and-azure-resources.md
index 21ba92d8a..ae25ed00f 100644
--- a/docs/create-image-and-azure-resources.md
+++ b/docs/create-image-and-azure-resources.md
@@ -101,6 +101,7 @@ The function creates an Azure VM from a template and generates network resources
 ### User variables
 The Packer template includes `variables` section containing user variables used in image generation. Each variable is defined as a key/value strings. User variables can be passed to packer via predefined environment variables, or as direct arguments, in case if packer started manually.
 
+- `build_resource_group_name` - Specify an existing resource group to run the build in it. By default, a temporary resource group will be created and destroyed as part of the build. If you do not have permission to do so, use build_resource_group_name to specify an existing resource group to run the build in it.
 - `client_id` - The application ID of the AAD Service Principal. Requires `client_secret`.
 - `object_id` - The object ID for the AAD SP. Will be derived from the oAuth token if empty.
 - `client_secret` - A password/secret registered for the AAD SP.