diff --git a/tools/offline.ml b/tools/offline.ml
index cf2adb37..6d0e2196 100644
--- a/tools/offline.ml
+++ b/tools/offline.ml
@@ -2,6 +2,9 @@ open Cmdliner
 open Cmdliner.Term.Syntax
 open Offline_impl
 
+let base_url = Uri.of_string "http://localhost:3434/"
+let default_master_offline_key_file = "data/master_offline_private_key"
+
 module Arg = struct
   include Arg
 
@@ -16,9 +19,16 @@ module Arg = struct
   let amount =
     Arg.Conv.make ~docv:"amount argument" ~parser:Amount.of_string ~pp:Amount.pp
       ()
+
+  let url =
+    let parser path =
+let full_url path =
+  Uri.with_path base_url path |> Uri.to_string
+in
+    Arg.Conv.make ~docv:"amount argument" ~parser ~pp
+      ()
 end
 
-let default_master_offline_key_file = "data/master_offline_private_key"
 (*
 let default_response_file = "response.json"
 let default_request_file = "request.json"
@@ -103,6 +113,18 @@ let revoke_signkey_cmd =
   let+ output = output and+ master_key = master_key and+ signkey = signkey in
   revoke_signkey ~output ~master_key ~signkey
 
+let enable_auditor_cmd =
+  let doc = "Enable an auditor." in
+  let auditor_url =
+    Arg.(required & opt (some url) None & info [ "auditor_url" ])
+  in
+  Cmd.make (Cmd.info "global-fees" ~doc)
+  @@
+  let+ output = output
+  and+ master_key = master_key
+  and+ auditor_url = auditor_url in
+  enable_auditor ~output ~master_key ~auditor_url
+
 let global_fees_cmd =
   let doc = "Provides global fee configuration." in
   let start_date =
diff --git a/tools/offline_impl.ml b/tools/offline_impl.ml
index c6e38015..eadc948f 100644
--- a/tools/offline_impl.ml
+++ b/tools/offline_impl.ml
@@ -9,9 +9,6 @@ let read_master_key_file filename =
   let* master_key = read_file filename in
   Crypto.EddsaPrivateKey.of_octets master_key
 
-let base_url = Uri.of_string "http://localhost:3434/"
-let full_url path = Uri.with_path base_url path |> Uri.to_string
-
 let download ~output =
   let open Bos in
   let uri = full_url "/management/keys/" in
@@ -135,3 +132,7 @@ let global_fees ~output ~master_key ~start_date ~end_date ~history_fee
   let* s = Api.encode Api.GlobalFees.jsont global_fees in
   let* () = write_file output s in
   Ok ()
+
+[@@@ocaml.warning "-27"]
+
+let enable_auditor ~output ~master_key ~auditor_url = assert false