diff --git a/src/connectedk8s/azext_connectedk8s/_params.py b/src/connectedk8s/azext_connectedk8s/_params.py
index 3ad0c2ba3cd..4aeaa5a2c87 100644
--- a/src/connectedk8s/azext_connectedk8s/_params.py
+++ b/src/connectedk8s/azext_connectedk8s/_params.py
@@ -33,7 +33,7 @@ def load_arguments(self, _):
         c.argument('https_proxy', options_list=['--proxy-https'], arg_group='Proxy', help='Https proxy URL to be used.')
         c.argument('http_proxy', options_list=['--proxy-http'], arg_group='Proxy', help='Http proxy URL to be used.')
         c.argument('no_proxy', options_list=['--proxy-skip-range'], arg_group='Proxy', help='List of URLs/CIDRs for which proxy should not to be used.')
-        c.argument('proxy_cert', options_list=['--proxy-cert'], arg_group='Proxy', type=file_type, completer=FilesCompleter(), help='Path to the certificate file for proxy')
+        c.argument('proxy_cert', options_list=['--proxy-cert', '--custom-ca-cert'], arg_group='Proxy', type=file_type, completer=FilesCompleter(), help='Path to the certificate file for proxy or custom Certificate Authority')
         c.argument('distribution', options_list=['--distribution'], help='The Kubernetes distribution which will be running on this connected cluster.', arg_type=get_enum_type(Distribution_Enum_Values))
         c.argument('infrastructure', options_list=['--infrastructure'], help='The infrastructure on which the Kubernetes cluster represented by this connected cluster will be running on.', arg_type=get_enum_type(Infrastructure_Enum_Values))
         c.argument('disable_auto_upgrade', options_list=['--disable-auto-upgrade'], action='store_true', help='Flag to disable auto upgrade of arc agents.')
@@ -52,7 +52,7 @@ def load_arguments(self, _):
         c.argument('https_proxy', options_list=['--proxy-https'], arg_group='Proxy', help='Https proxy URL to be used.')
         c.argument('http_proxy', options_list=['--proxy-http'], arg_group='Proxy', help='Http proxy URL to be used.')
         c.argument('no_proxy', options_list=['--proxy-skip-range'], arg_group='Proxy', help='List of URLs/CIDRs for which proxy should not to be used.')
-        c.argument('proxy_cert', options_list=['--proxy-cert'], arg_group='Proxy', type=file_type, completer=FilesCompleter(), help='Path to the any additional certificate file (for proxy as well)')
+        c.argument('proxy_cert', options_list=['--proxy-cert', '--custom-ca-cert'], arg_group='Proxy', type=file_type, completer=FilesCompleter(), help='Path to the certificate file for proxy or custom Certificate Authority')
         c.argument('disable_proxy', options_list=['--disable-proxy'], arg_group='Proxy', action='store_true', help='Disables proxy settings for agents')
         c.argument('auto_upgrade', options_list=['--auto-upgrade'], help='Flag to enable/disable auto upgrade of arc agents. By default, auto upgrade of agents is enabled.', arg_type=get_enum_type(["true", "false"]))