diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77959c415..b70302bbf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Mix tasks to help with displaying and removing ConfigDB entries. See `mix pleroma.config`.
 - OAuth form improvements: users are remembered by their cookie, the CSS is overridable by the admin, and the style has been improved.
 - OAuth improvements and fixes: more secure session-based authentication (by token that could be revoked anytime), ability to revoke belonging OAuth token from any client etc.
+- Ability to set ActivityPub aliases for follower migration.
 
 <details>
   <summary>API Changes</summary>
diff --git a/docs/API/differences_in_mastoapi_responses.md b/docs/API/differences_in_mastoapi_responses.md
index 1b197e073..84430408b 100644
--- a/docs/API/differences_in_mastoapi_responses.md
+++ b/docs/API/differences_in_mastoapi_responses.md
@@ -206,6 +206,7 @@ Additional parameters can be added to the JSON body/Form data:
 - `pleroma_settings_store` - Opaque user settings to be saved on the backend.
 - `skip_thread_containment` - if true, skip filtering out broken threads
 - `allow_following_move` - if true, allows automatically follow moved following accounts
+- `also_known_as` - array of ActivityPub IDs, needed for following move
 - `pleroma_background_image` - sets the background image of the user. Can be set to "" (an empty string) to reset.
 - `discoverable` - if true, external services (search bots) etc. are allowed to index / list the account (regardless of this setting, user will still appear in regular search results).
 - `actor_type` - the type of this account.
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index bd4801058..52730fd8d 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -142,7 +142,7 @@ defmodule Pleroma.User do
     field(:allow_following_move, :boolean, default: true)
     field(:skip_thread_containment, :boolean, default: false)
     field(:actor_type, :string, default: "Person")
-    field(:also_known_as, {:array, :string}, default: [])
+    field(:also_known_as, {:array, ObjectValidators.ObjectID}, default: [])
     field(:inbox, :string)
     field(:shared_inbox, :string)
     field(:accepts_chat_messages, :boolean, default: nil)
@@ -515,6 +515,7 @@ def update_changeset(struct, params \\ %{}) do
         :hide_follows_count,
         :hide_favorites,
         :allow_following_move,
+        :also_known_as,
         :background,
         :show_role,
         :skip_thread_containment,
@@ -523,7 +524,6 @@ def update_changeset(struct, params \\ %{}) do
         :pleroma_settings_store,
         :is_discoverable,
         :actor_type,
-        :also_known_as,
         :accepts_chat_messages
       ]
     )
diff --git a/lib/pleroma/web/activity_pub/views/user_view.ex b/lib/pleroma/web/activity_pub/views/user_view.ex
index 93c9f436c..241224b57 100644
--- a/lib/pleroma/web/activity_pub/views/user_view.ex
+++ b/lib/pleroma/web/activity_pub/views/user_view.ex
@@ -112,7 +112,8 @@ def render("user.json", %{user: user}) do
       "tag" => emoji_tags,
       # Note: key name is indeed "discoverable" (not an error)
       "discoverable" => user.is_discoverable,
-      "capabilities" => capabilities
+      "capabilities" => capabilities,
+      "alsoKnownAs" => user.also_known_as
     }
     |> Map.merge(maybe_make_image(&User.avatar_url/2, "icon", user))
     |> Map.merge(maybe_make_image(&User.banner_url/2, "image", user))
diff --git a/lib/pleroma/web/api_spec/operations/account_operation.ex b/lib/pleroma/web/api_spec/operations/account_operation.ex
index 280100c3d..bd3a73c11 100644
--- a/lib/pleroma/web/api_spec/operations/account_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/account_operation.ex
@@ -614,6 +614,12 @@ defp update_credentials_request do
           nullable: true,
           description: "Allows automatically follow moved following accounts"
         },
+        also_known_as: %Schema{
+          type: :array,
+          items: %Schema{type: :string},
+          nullable: true,
+          description: "List of alternate ActivityPub IDs"
+        },
         pleroma_background_image: %Schema{
           type: :string,
           nullable: true,
@@ -644,6 +650,7 @@ defp update_credentials_request do
         pleroma_settings_store: %{"pleroma-fe" => %{"key" => "val"}},
         skip_thread_containment: false,
         allow_following_move: false,
+        also_known_as: ["https://foo.bar/users/foo"],
         discoverable: false,
         actor_type: "Person"
       }
diff --git a/lib/pleroma/web/api_spec/schemas/account.ex b/lib/pleroma/web/api_spec/schemas/account.ex
index 684f6fc92..70437003c 100644
--- a/lib/pleroma/web/api_spec/schemas/account.ex
+++ b/lib/pleroma/web/api_spec/schemas/account.ex
@@ -40,6 +40,8 @@ defmodule Pleroma.Web.ApiSpec.Schemas.Account do
       pleroma: %Schema{
         type: :object,
         properties: %{
+          ap_id: %Schema{type: :string},
+          also_known_as: %Schema{type: :array, items: %Schema{type: :string}},
           allow_following_move: %Schema{
             type: :boolean,
             description: "whether the user allows automatically follow moved following accounts"
diff --git a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
index b4375872b..3951d10ac 100644
--- a/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/account_controller.ex
@@ -184,6 +184,7 @@ def update_credentials(%{assigns: %{user: user}, body_params: params} = conn, _p
         :show_role,
         :skip_thread_containment,
         :allow_following_move,
+        :also_known_as,
         :accepts_chat_messages
       ]
       |> Enum.reduce(%{}, fn key, acc ->
@@ -207,6 +208,7 @@ def update_credentials(%{assigns: %{user: user}, body_params: params} = conn, _p
         if bot, do: {:ok, "Service"}, else: {:ok, "Person"}
       end)
       |> Maps.put_if_present(:actor_type, params[:actor_type])
+      |> Maps.put_if_present(:also_known_as, params[:also_known_as])
       # Note: param name is indeed :locked (not an error)
       |> Maps.put_if_present(:is_locked, params[:locked])
       # Note: param name is indeed :discoverable (not an error)
diff --git a/lib/pleroma/web/mastodon_api/views/account_view.ex b/lib/pleroma/web/mastodon_api/views/account_view.ex
index 026ae9458..948a05a6d 100644
--- a/lib/pleroma/web/mastodon_api/views/account_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/account_view.ex
@@ -265,6 +265,7 @@ defp do_render("show.json", %{user: user} = opts) do
       # Pleroma extension
       pleroma: %{
         ap_id: user.ap_id,
+        also_known_as: user.also_known_as,
         confirmation_pending: user.confirmation_pending,
         tags: user.tags,
         hide_followers_count: user.hide_followers_count,
diff --git a/lib/pleroma/web/web_finger.ex b/lib/pleroma/web/web_finger.ex
index 2e39ae048..a109e1acc 100644
--- a/lib/pleroma/web/web_finger.ex
+++ b/lib/pleroma/web/web_finger.ex
@@ -58,12 +58,16 @@ defp gather_links(%User{} = user) do
     ] ++ Publisher.gather_webfinger_links(user)
   end
 
+  defp gather_aliases(%User{} = user) do
+    [user.ap_id | user.also_known_as]
+  end
+
   def represent_user(user, "JSON") do
     {:ok, user} = User.ensure_keys_present(user)
 
     %{
       "subject" => "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}",
-      "aliases" => [user.ap_id],
+      "aliases" => gather_aliases(user),
       "links" => gather_links(user)
     }
   end
@@ -71,6 +75,11 @@ def represent_user(user, "JSON") do
   def represent_user(user, "XML") do
     {:ok, user} = User.ensure_keys_present(user)
 
+    aliases =
+      user
+      |> gather_aliases()
+      |> Enum.map(&{:Alias, &1})
+
     links =
       gather_links(user)
       |> Enum.map(fn link -> {:Link, link} end)
@@ -79,9 +88,8 @@ def represent_user(user, "XML") do
       :XRD,
       %{xmlns: "http://docs.oasis-open.org/ns/xri/xrd-1.0"},
       [
-        {:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}"},
-        {:Alias, user.ap_id}
-      ] ++ links
+        {:Subject, "acct:#{user.nickname}@#{Pleroma.Web.Endpoint.host()}"}
+      ] ++ aliases ++ links
     }
     |> XmlBuilder.to_doc()
   end
diff --git a/test/pleroma/web/activity_pub/views/user_view_test.exs b/test/pleroma/web/activity_pub/views/user_view_test.exs
index fe6ddf0d6..5702c1b6f 100644
--- a/test/pleroma/web/activity_pub/views/user_view_test.exs
+++ b/test/pleroma/web/activity_pub/views/user_view_test.exs
@@ -80,6 +80,12 @@ test "renders an invisible user with the invisible property set to true" do
     assert %{"invisible" => true} = UserView.render("service.json", %{user: user})
   end
 
+  test "renders AKAs" do
+    akas = ["https://i.tusooa.xyz/users/test-pleroma"]
+    user = insert(:user, also_known_as: akas)
+    assert %{"alsoKnownAs" => ^akas} = UserView.render("user.json", %{user: user})
+  end
+
   describe "endpoints" do
     test "local users have a usable endpoints structure" do
       user = insert(:user)
diff --git a/test/pleroma/web/mastodon_api/update_credentials_test.exs b/test/pleroma/web/mastodon_api/update_credentials_test.exs
index 023726468..e3e437a19 100644
--- a/test/pleroma/web/mastodon_api/update_credentials_test.exs
+++ b/test/pleroma/web/mastodon_api/update_credentials_test.exs
@@ -218,6 +218,25 @@ test "updates the user's name", %{conn: conn} do
       assert update_activity.data["object"]["name"] == "markorepairs"
     end
 
+    test "updates the user's AKAs", %{conn: conn} do
+      conn =
+        patch(conn, "/api/v1/accounts/update_credentials", %{
+          "also_known_as" => ["https://mushroom.kingdom/users/mario"]
+        })
+
+      assert user_data = json_response_and_validate_schema(conn, 200)
+      assert user_data["pleroma"]["also_known_as"] == ["https://mushroom.kingdom/users/mario"]
+    end
+
+    test "doesn't update non-url akas", %{conn: conn} do
+      conn =
+        patch(conn, "/api/v1/accounts/update_credentials", %{
+          "also_known_as" => ["aReallyCoolGuy"]
+        })
+
+      assert json_response_and_validate_schema(conn, 403)
+    end
+
     test "updates the user's avatar", %{user: user, conn: conn} do
       new_avatar = %Plug.Upload{
         content_type: "image/jpeg",
diff --git a/test/pleroma/web/mastodon_api/views/account_view_test.exs b/test/pleroma/web/mastodon_api/views/account_view_test.exs
index 8c77f14d4..f9afd0afc 100644
--- a/test/pleroma/web/mastodon_api/views/account_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/account_view_test.exs
@@ -35,7 +35,8 @@ test "Represent a user account" do
           "<script src=\"invalid-html\"></script><span>valid html</span>. a<br>b<br/>c<br >d<br />f '&<>\"",
         inserted_at: ~N[2017-08-15 15:47:06.597036],
         emoji: %{"karjalanpiirakka" => "/file.png"},
-        raw_bio: "valid html. a\nb\nc\nd\nf '&<>\""
+        raw_bio: "valid html. a\nb\nc\nd\nf '&<>\"",
+        also_known_as: ["https://shitposter.zone/users/shp"]
       })
 
     expected = %{
@@ -75,6 +76,7 @@ test "Represent a user account" do
       },
       pleroma: %{
         ap_id: user.ap_id,
+        also_known_as: ["https://shitposter.zone/users/shp"],
         background_image: "https://example.com/images/asuka_hospital.png",
         favicon: nil,
         confirmation_pending: false,
@@ -173,6 +175,7 @@ test "Represent a Service(bot) account" do
       },
       pleroma: %{
         ap_id: user.ap_id,
+        also_known_as: [],
         background_image: nil,
         favicon: nil,
         confirmation_pending: false,
diff --git a/test/pleroma/web/web_finger/web_finger_controller_test.exs b/test/pleroma/web/web_finger/web_finger_controller_test.exs
index 0023f1e81..ce9eb0650 100644
--- a/test/pleroma/web/web_finger/web_finger_controller_test.exs
+++ b/test/pleroma/web/web_finger/web_finger_controller_test.exs
@@ -30,14 +30,24 @@ test "GET host-meta" do
   end
 
   test "Webfinger JRD" do
-    user = insert(:user)
+    user =
+      insert(:user,
+        ap_id: "https://hyrule.world/users/zelda",
+        also_known_as: ["https://mushroom.kingdom/users/toad"]
+      )
 
     response =
       build_conn()
       |> put_req_header("accept", "application/jrd+json")
       |> get("/.well-known/webfinger?resource=acct:#{user.nickname}@localhost")
+      |> json_response(200)
 
-    assert json_response(response, 200)["subject"] == "acct:#{user.nickname}@localhost"
+    assert response["subject"] == "acct:#{user.nickname}@localhost"
+
+    assert response["aliases"] == [
+             "https://hyrule.world/users/zelda",
+             "https://mushroom.kingdom/users/toad"
+           ]
   end
 
   test "it returns 404 when user isn't found (JSON)" do
@@ -51,14 +61,20 @@ test "it returns 404 when user isn't found (JSON)" do
   end
 
   test "Webfinger XML" do
-    user = insert(:user)
+    user =
+      insert(:user,
+        ap_id: "https://hyrule.world/users/zelda",
+        also_known_as: ["https://mushroom.kingdom/users/toad"]
+      )
 
     response =
       build_conn()
       |> put_req_header("accept", "application/xrd+xml")
       |> get("/.well-known/webfinger?resource=acct:#{user.nickname}@localhost")
+      |> response(200)
 
-    assert response(response, 200)
+    assert response =~ "<Alias>https://hyrule.world/users/zelda</Alias>"
+    assert response =~ "<Alias>https://mushroom.kingdom/users/toad</Alias>"
   end
 
   test "it returns 404 when user isn't found (XML)" do