diff --git a/README.md b/README.md
index 317a3c7..5290f5c 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ Here, implemented and some unimplemented features are listed.
 - GET /_matrix/client/r0/login
 - POST /_matrix/client/r0/login: Only with password flow.
 - POST /_matrix/client/r0/register: Only with dummy flow.
-- POST /_matrix/client/r0/createRoom: Except creation_content, initial_state, invite_3pid and initial_state.
+- POST /_matrix/client/r0/createRoom: Except with options invite_3pid, initial_state and room_alias_name.
 - GET /_matrix/client/r0/joined_rooms
 - POST /_matrix/client/r0/rooms/{roomId}/invite
 - POST /_matrix/client/r0/rooms/{roomId}/join: Except with third party invite.
diff --git a/lib/architex/room_server.ex b/lib/architex/room_server.ex
index c7a6c32..c74a8a0 100644
--- a/lib/architex/room_server.ex
+++ b/lib/architex/room_server.ex
@@ -449,11 +449,12 @@ defmodule Architex.RoomServer do
          topic: topic,
          invite: invite,
          power_level_content_override: power_level_content_override,
-         is_direct: is_direct
+         is_direct: is_direct,
+         creation_content: creation_content
        }) do
     events =
       ([
-         Event.CreateRoom.new(room, account, room_version),
+         Event.CreateRoom.new(room, account, room_version, creation_content),
          Event.Join.new(room, account),
          Event.PowerLevels.create_room_new(room, account, power_level_content_override)
        ] ++
diff --git a/lib/architex/schema/event/generators.ex b/lib/architex/schema/event/generators.ex
index 4edb6fd..37bb9c6 100644
--- a/lib/architex/schema/event/generators.ex
+++ b/lib/architex/schema/event/generators.ex
@@ -19,18 +19,31 @@ end
 defmodule Architex.Event.CreateRoom do
   alias Architex.{Event, Account, Room}
 
-  @spec new(Room.t(), Account.t(), String.t()) :: %Event{}
-  def new(room, %Account{localpart: localpart} = creator, room_version) do
+  @clobber_content_keys ["creator", "room_version"]
+
+  @spec new(Room.t(), Account.t(), String.t(), %{optional(String.t()) => any()} | nil) :: %Event{}
+  def new(room, %Account{localpart: localpart} = creator, room_version, creation_content) do
     mxid = Architex.get_mxid(localpart)
 
+    content = %{
+      "creator" => mxid,
+      "room_version" => room_version || Architex.default_room_version()
+    }
+
+    content =
+      if creation_content do
+        creation_content
+        |> Map.drop(@clobber_content_keys)
+        |> Map.merge(content)
+      else
+        content
+      end
+
     %Event{
       Event.new(room, creator)
       | type: "m.room.create",
         state_key: "",
-        content: %{
-          "creator" => mxid,
-          "room_version" => room_version || Architex.default_room_version()
-        }
+        content: content
     }
   end
 end
diff --git a/lib/architex_web/api_schemas/client/request/create_room.ex b/lib/architex_web/api_schemas/client/request/create_room.ex
index f84ec95..95a4f85 100644
--- a/lib/architex_web/api_schemas/client/request/create_room.ex
+++ b/lib/architex_web/api_schemas/client/request/create_room.ex
@@ -10,6 +10,7 @@ defmodule ArchitexWeb.Client.Request.CreateRoom do
           room_version: String.t() | nil,
           preset: String.t() | nil,
           is_direct: boolean() | nil,
+          creation_content: %{optional(String.t()) => any()} | nil,
           power_level_content_override: plco_t() | nil
         }
 
@@ -40,6 +41,7 @@ defmodule ArchitexWeb.Client.Request.CreateRoom do
     field :room_version, :string
     field :preset, :string
     field :is_direct, :boolean
+    field :creation_content, :map
 
     embeds_one :power_level_content_override, PowerLevelContentOverride, primary_key: false do
       field :ban, :integer
@@ -57,8 +59,7 @@ defmodule ArchitexWeb.Client.Request.CreateRoom do
       end
     end
 
-    # TODO: unimplemented:
-    # creation_content, initial_state, invite_3pid, initial_state
+    # TODO: unimplemented: invite_3pid, initial_state, room_alias_name
   end
 
   def changeset(data, params) do
@@ -71,7 +72,8 @@ defmodule ArchitexWeb.Client.Request.CreateRoom do
       :invite,
       :room_version,
       :preset,
-      :is_direct
+      :is_direct,
+      :creation_content
     ])
     |> cast_embed(:power_level_content_override,
       with: &power_level_content_override_changeset/2,