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 043cfaa5618..4c7f47fbd79 100644
--- a/src/azure-cli/azure/cli/command_modules/vm/_help.py
+++ b/src/azure-cli/azure/cli/command_modules/vm/_help.py
@@ -1766,7 +1766,7 @@
 helps['vm list'] = """
 type: command
 short-summary: List details of Virtual Machines.
-long-summary: 'For more information on querying information about Virtual Machines, see https://docs.microsoft.com/cli/azure/query-az-cli2'
+long-summary: '`--resource-group` can pass in an empty string as a parameter, which will output all VM information under the subscription. For more information on querying information about Virtual Machines, see https://docs.microsoft.com/cli/azure/query-az-cli2'
 examples:
   - name: List all VMs.
     text: az vm list