diff --git a/openstackclient/identity/v3/limit.py b/openstackclient/identity/v3/limit.py
index 59cc1398c2..44a3f63569 100644
--- a/openstackclient/identity/v3/limit.py
+++ b/openstackclient/identity/v3/limit.py
@@ -90,6 +90,13 @@ class CreateLimit(command.ShowOne):
                 region = common_utils.get_resource(
                     identity_client.regions, parsed_args.region
                 )
+            else:
+                self.log.warning(
+                    _(
+                        "Passing 'None' to indicate no region is deprecated. "
+                        "Instead, don't pass --region."
+                    )
+                )
 
         limit = identity_client.limits.create(
             project,
@@ -158,6 +165,14 @@ class ListLimit(command.Lister):
                 region = common_utils.get_resource(
                     identity_client.regions, parsed_args.region
                 )
+            else:
+                self.log.warning(
+                    _(
+                        "Passing 'None' to indicate no region is deprecated. "
+                        "Instead, don't pass --region."
+                    )
+                )
+
         project = None
         if parsed_args.project:
             project = utils.find_resource(
diff --git a/openstackclient/identity/v3/registered_limit.py b/openstackclient/identity/v3/registered_limit.py
index f71ef1f5a3..336151ddbf 100644
--- a/openstackclient/identity/v3/registered_limit.py
+++ b/openstackclient/identity/v3/registered_limit.py
@@ -81,6 +81,13 @@ class CreateRegisteredLimit(command.ShowOne):
                 region = common_utils.get_resource(
                     identity_client.regions, parsed_args.region
                 )
+            else:
+                self.log.warning(
+                    _(
+                        "Passing 'None' to indicate no region is deprecated. "
+                        "Instead, don't pass --region."
+                    )
+                )
 
         registered_limit = identity_client.registered_limits.create(
             service,
@@ -182,6 +189,13 @@ class ListRegisteredLimit(command.Lister):
                 region = common_utils.get_resource(
                     identity_client.regions, parsed_args.region
                 )
+            else:
+                self.log.warning(
+                    _(
+                        "Passing 'None' to indicate no region is deprecated. "
+                        "Instead, don't pass --region."
+                    )
+                )
 
         registered_limits = identity_client.registered_limits.list(
             service=service,
@@ -280,6 +294,10 @@ class SetRegisteredLimit(command.ShowOne):
                 region = common_utils.get_resource(
                     identity_client.regions, parsed_args.region
                 )
+            else:
+                self.log.warning(
+                    _("Passing 'None' to indicate no region is deprecated.")
+                )
 
         registered_limit = identity_client.registered_limits.update(
             parsed_args.registered_limit_id,