diff --git a/src/bin_dal_node/cli.ml b/src/bin_dal_node/cli.ml
index 8f2c3b04fdcc0a47f8f7fcacfa7e142868993f05..2ded2d73300711ffc9901af43878b1e0656fe805 100644
--- a/src/bin_dal_node/cli.ml
+++ b/src/bin_dal_node/cli.ml
@@ -178,7 +178,7 @@ module Term = struct
     Arg.(
       value
       & opt (list attester_profile_arg) []
-      & info ~docs ~doc ~docv:"PKH1,PKH2,..." ["attester-profiles"])
+      & info ~docs ~doc ~docv:"PKH1,PKH2,..." ["attester-profiles"; "attester"])
 
   let producer_profile =
     let open Cmdliner in
@@ -186,15 +186,23 @@ module Term = struct
     Arg.(
       value
       & opt (list producer_profile_arg) []
-      & info ~docs ~doc ~docv:"INDEX1,INDEX2,..." ["producer-profiles"])
+      & info
+          ~docs
+          ~doc
+          ~docv:"INDEX1,INDEX2,..."
+          ["producer-profiles"; "producer"; "operator"])
 
   let observer_profile =
     let open Cmdliner in
     let doc = "The Octez DAL node observer profiles for given slot indexes." in
     Arg.(
       value
-      & opt (list observer_profile_arg) []
-      & info ~docs ~doc ~docv:"INDEX1,INDEX2,..." ["observer-profiles"])
+      & opt (some' (list observer_profile_arg)) None
+      & info
+          ~docs
+          ~doc
+          ~docv:"INDEX1,INDEX2,..."
+          ["observer-profiles"; "observer"])
 
   let bootstrap_profile =
     let open Cmdliner in
@@ -202,7 +210,7 @@ module Term = struct
       "The Octez DAL node bootstrap node profile. Note that a bootstrap node \
        cannot also be an attester or a slot producer"
     in
-    Arg.(value & flag & info ~docs ~doc ["bootstrap-profile"])
+    Arg.(value & flag & info ~docs ~doc ["bootstrap-profile"; "bootstrap"])
 
   let peers =
     let open Cmdliner in
@@ -362,16 +370,23 @@ let make ~run =
           history_mode;
         }
     in
-    let profile = Operator_profile.make ~attesters ~producers ~observers () in
-    match (bootstrap_flag, profile) with
-    | false, profiles when Operator_profile.is_empty profiles -> run None
-    | true, profiles when Operator_profile.is_empty profiles ->
+    let profile = Operator_profile.make ~attesters ~producers ?observers () in
+    match (bootstrap_flag, observers, profile) with
+    | false, None, profiles when Operator_profile.is_empty profiles -> run None
+    | false, Some _, profiles when Operator_profile.is_empty profiles ->
+        (* The user only mentioned '--observer' without any slot and
+           without any other profile. It will be assigned to random
+           slots. *)
+        run (Some Profile_manager.random_observer)
+    | false, _, _ -> run @@ Some (Profile_manager.operator profile)
+    | true, None, profiles when Operator_profile.is_empty profiles ->
         run @@ Some Profile_manager.bootstrap
-    | false, profiles -> run @@ Some (Profile_manager.operator profiles)
-    | true, _ ->
+    | true, _, _ ->
         `Error
           ( false,
-            "A bootstrap node cannot also be an attester or a slot producer." )
+            "a bootstrap node (option '--bootstrap') cannot be an attester \
+             (option '--attester'), an operator (option '--operator') nor an \
+             observer (option '--observer')" )
   in
   let default = Cmdliner.Term.(ret (const (`Help (`Pager, None)))) in
   let info =
diff --git a/src/bin_dal_node/profile_manager.ml b/src/bin_dal_node/profile_manager.ml
index b79302675b185493e0a2bfee231eef0afb90bfe4..72a42d79a59d55c7c12e41f587f3ead9349adad1 100644
--- a/src/bin_dal_node/profile_manager.ml
+++ b/src/bin_dal_node/profile_manager.ml
@@ -33,6 +33,8 @@ let encoding = Types.profile_encoding
 
 let bootstrap = Types.Bootstrap
 
+let random_observer = Types.Random_observer
+
 let operator operator_profile = Types.Operator operator_profile
 
 let is_empty = function
diff --git a/src/bin_dal_node/profile_manager.mli b/src/bin_dal_node/profile_manager.mli
index 206d0e1bb51b5ec740486c6d0dc466490140fd3b..4683bd9085a3858a286057a0d29988f022f550f1 100644
--- a/src/bin_dal_node/profile_manager.mli
+++ b/src/bin_dal_node/profile_manager.mli
@@ -50,6 +50,8 @@ val empty : t
 
 val bootstrap : t
 
+val random_observer : t
+
 (** [operator op] returns an operator with the profile described by [op] *)
 val operator : Operator_profile.t -> t
 
diff --git a/src/lib_dal_node_services/operator_profile.ml b/src/lib_dal_node_services/operator_profile.ml
index 097241f867fbf8cc3926bf35f24fdb32e78e31ab..d8eabeb62e430a869c827145fe86ddedf601e411 100644
--- a/src/lib_dal_node_services/operator_profile.ml
+++ b/src/lib_dal_node_services/operator_profile.ml
@@ -92,7 +92,8 @@ let encoding =
         attesters = Pkh_set.of_list attesters;
       })
     (obj3
-       (req "producers" (list int31))
+       (* Use the new name in the encoding. *)
+       (req "operators" (list int31))
        (req "observers" (list int31))
        (req "attesters" (list Signature.Public_key_hash.encoding)))
 
@@ -162,13 +163,13 @@ let encoding =
   union
     [
       case
-        ~title:"operator_profile_encoding"
+        ~title:"profile_encoding"
         Json_only
         encoding
         (fun v -> Some v)
         (fun v -> v);
       case
-        ~title:"legacy_operator_profile_encoding"
+        ~title:"legacy_profile_encoding"
         Json_only
         (conv (fun _ -> assert false) from_legacy Legacy.encoding)
         (fun _ -> None)
diff --git a/src/lib_dal_node_services/types.ml b/src/lib_dal_node_services/types.ml
index bae69013b83760ecd7fae7bfd803a4e1b8c9e275..d920643b454402101d8e1f612e6c1b2ce1de2b4b 100644
--- a/src/lib_dal_node_services/types.ml
+++ b/src/lib_dal_node_services/types.ml
@@ -409,11 +409,11 @@ let profile_encoding =
         (function Bootstrap -> Some () | _ -> None)
         (function () -> Bootstrap);
       case
-        ~title:"Operator"
+        ~title:"Controller"
         (Tag 2)
         (obj2
-           (req "kind" (constant "operator"))
-           (req "operator_profiles" Operator_profile.encoding))
+           (req "kind" (constant "controller"))
+           (req "controller_profiles" Operator_profile.encoding))
         (function
           | Operator operator_profiles -> Some ((), operator_profiles)
           | _ -> None)
diff --git a/tezt/lib_tezos/dal_common.ml b/tezt/lib_tezos/dal_common.ml
index c9ea62645210081e90120a24c34ae84e5623bba1..9d494158d27cc4dc0c049baeed385f3f48927ddb 100644
--- a/tezt/lib_tezos/dal_common.ml
+++ b/tezt/lib_tezos/dal_common.ml
@@ -259,14 +259,14 @@ module Dal_RPC = struct
     `O
       [
         ("attesters", `A (List.rev attesters));
-        ("producers", `A (List.rev producers));
+        ("operators", `A (List.rev producers));
         ("observers", `A (List.rev observers));
       ]
 
   let operator_profile_of_json json =
     let open JSON in
     let attesters = json |-> "attesters" |> as_list |> List.map as_string in
-    let producers = json |-> "producers" |> as_list |> List.map as_int in
+    let producers = json |-> "operators" |> as_list |> List.map as_int in
     let observers = json |-> "observers" |> as_list |> List.map as_int in
     List.map (fun pkh -> Attester pkh) attesters
     @ List.map (fun i -> Producer i) producers
@@ -276,9 +276,9 @@ module Dal_RPC = struct
     let open JSON in
     match json |-> "kind" |> as_string with
     | "bootstrap" -> Bootstrap
-    | "operator" ->
+    | "controller" ->
         let operator_profiles =
-          operator_profile_of_json (json |-> "operator_profiles")
+          operator_profile_of_json (json |-> "controller_profiles")
         in
         Operator operator_profiles
     | _ -> failwith "invalid case"