diff --git a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_help.py b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_help.py
index 0087f9e813f..8101fe21012 100644
--- a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_help.py
+++ b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_help.py
@@ -369,6 +369,9 @@
 helps['network dns zone update'] = """
     type: command
     short-summary: Updates DNS zone properties. Does not modify DNS records within the zone.
+    parameters:
+        - name: --if-match
+          short-summary: Update only if the resource with the same ETAG exists.
 """
 helps['network express-route'] = """
     type: group
diff --git a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_params.py b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_params.py
index 74199c07a8a..bace0f1c16f 100644
--- a/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_params.py
+++ b/src/command_modules/azure-cli-network/azure/cli/command_modules/network/_params.py
@@ -424,3 +424,4 @@ def completer(prefix, action, parsed_args, **kwargs): # pylint: disable=unused-a
 register_cli_argument('network dns zone import', 'file_name', help='Path to the DNS zone file to import')
 register_cli_argument('network dns zone export', 'file_name', help='Path to the DNS zone file to save')
 register_cli_argument('network dns', 'location', help=argparse.SUPPRESS, default='global')
+register_cli_argument('network dns zone update', 'if_none_match', ignore_type)