diff --git a/src/azure-cli/azure/cli/command_modules/appservice/custom.py b/src/azure-cli/azure/cli/command_modules/appservice/custom.py
index b9214a7d588..22119f7d2f7 100644
--- a/src/azure-cli/azure/cli/command_modules/appservice/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/appservice/custom.py
@@ -2339,7 +2339,7 @@ def create_function(cmd, resource_group_name, name, storage_account, plan=None,
     # pylint: disable=too-many-statements, too-many-branches
     if functions_version is None:
         logger.warning("No functions version specified so defaulting to 2. In the future, specifying a version will "
-                       "be required. To create a 2.x function you would pass in the flag `--functions_version 2`")
+                       "be required. To create a 2.x function you would pass in the flag `--functions-version 2`")
         functions_version = '2'
     if deployment_source_url and deployment_local_git:
         raise CLIError('usage error: --deployment-source-url <url> | --deployment-local-git')