diff --git a/src/azure-cli/azure/cli/command_modules/vm/_help.py b/src/azure-cli/azure/cli/command_modules/vm/_help.py
index 944f97988f8..7535d8ec6ea 100644
--- a/src/azure-cli/azure/cli/command_modules/vm/_help.py
+++ b/src/azure-cli/azure/cli/command_modules/vm/_help.py
@@ -1843,7 +1843,7 @@
     text: az vm unmanaged-disk attach -g MyResourceGroup --vm-name MyVm --new
   - name: Attach an existing data disk to a VM as unmanaged.
     text: >
-        az vm unmanaged-disk attach -g MyResourceGroup --vm-name MyVm \\
+        az vm unmanaged-disk attach -g MyResourceGroup --vm-name MyVm --name MyDataDisk \\
             --vhd-uri https://mystorage.blob.core.windows.net/vhds/d1.vhd
   - name: Attach an unmanaged persistent disk to a VM. (autogenerated)
     text: az vm unmanaged-disk attach --name MyDataDisk --new --resource-group MyResourceGroup --size-gb 50 --vm-name MyVm