diff --git a/Riot/Modules/Room/Views/BubbleCells/Styles/RoomTimelineCellDecorator.swift b/Riot/Modules/Room/Views/BubbleCells/Styles/RoomTimelineCellDecorator.swift
new file mode 100644
index 000000000..ac4bae16c
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+++ b/Riot/Modules/Room/Views/BubbleCells/Styles/RoomTimelineCellDecorator.swift
@@ -0,0 +1,45 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import UIKit
+
+/// RoomTimelineCellDecorator enables to add decoration on a cell (reactions, read receipts, timestamp, URL preview).
+@objc
+protocol RoomTimelineCellDecorator {
+        
+    func addTimestampLabel(toCell cell: MXKRoomBubbleTableViewCell,
+                           cellData: RoomBubbleCellData)
+    
+    func addURLPreviewView(_ urlPreviewView: URLPreviewView,
+                           toCell cell: MXKRoomBubbleTableViewCell,
+                           cellData: RoomBubbleCellData,
+                           contentViewPositionY: CGFloat)
+    
+    func addReactionView(_ reactionsView: BubbleReactionsView,
+                         toCell cell: MXKRoomBubbleTableViewCell,
+                         cellData: RoomBubbleCellData,
+                         contentViewPositionY: CGFloat,
+                         upperDecorationView: UIView?)
+    
+    func addReadReceiptsView(_ readReceiptsView: MXKReceiptSendersContainer,
+                             toCell cell: MXKRoomBubbleTableViewCell,
+                             cellData: RoomBubbleCellData,
+                             contentViewPositionY: CGFloat,
+                             upperDecorationView: UIView?)
+    
+    func addSendStatusView(toCell cell: MXKRoomBubbleTableViewCell,
+                           withFailedEventIds failedEventIds: Set<AnyHashable>)
+}