diff --git a/matrix_pygmalion_bot/chatlog.py b/matrix_pygmalion_bot/chatlog.py
index 5737fc9..ef44e9a 100644
--- a/matrix_pygmalion_bot/chatlog.py
+++ b/matrix_pygmalion_bot/chatlog.py
@@ -52,7 +52,14 @@ class ChatHistory:
     def remove(self, num_items=1):
         for i in range(num_items):
             event_id, item = self.chat_history.popitem()
-        return item        
+        return item
+    def remove_id(self, event_id):
+        if event_id in self.chat_history:
+            del self.chat_history[event_id]
+        else:
+            logger.warning("remove_id: could not delete event. event_id not found in chat history")
+    def exists_id(self, event_id):
+        return (event_id in self.chat_history)
     def add(self, event_id, timestamp, user_name, is_own_message, is_command, relates_to_event, message, language="en", english_original_message=None):
         chat_message = ChatMessage(event_id, timestamp, user_name, is_own_message, is_command, relates_to_event, message, language, english_original_message)
         self.chat_history[chat_message.event_id] = chat_message
diff --git a/matrix_pygmalion_bot/core.py b/matrix_pygmalion_bot/core.py
index e8f84ff..7b0d7b9 100644
--- a/matrix_pygmalion_bot/core.py
+++ b/matrix_pygmalion_bot/core.py
@@ -1,6 +1,6 @@
 import asyncio
 import nio
-from nio import (AsyncClient, AsyncClientConfig, MatrixRoom, RoomMessageText, InviteEvent, UploadResponse)
+from nio import (AsyncClient, AsyncClientConfig, MatrixRoom, RoomMessageText, InviteEvent, UploadResponse, RedactionEvent)
 
 import os, sys
 import time
@@ -265,6 +265,16 @@ class Callbacks(object):
         else:
             logger.error("Error joining room: {}".format(str(result)))
 
+    async def redaction_cb(self, room: MatrixRoom, event: RedactionEvent) -> None:
+        logger.info(f"event redacted in room {room.room_id}. event_id: {event.redacts}")
+        for bot in bots:
+#            for room in bot.chat_history.chat_rooms.keys():
+            if room.display_name in bot.chat_history.chat_rooms:
+                logger.info("room found")
+                if bot.chat_history.chat_rooms[room.display_name].exists_id(event.redacts):
+                    logger.info("found it")
+                    bot.chat_history.chat_rooms[room.display_name].remove_id(event.redacts)
+
 class ChatBot(object):
     """Main chatbot"""
 
@@ -338,6 +348,7 @@ class ChatBot(object):
         self.callbacks = Callbacks(self.client, self)
         self.client.add_event_callback(self.callbacks.message_cb, RoomMessageText)
         self.client.add_event_callback(self.callbacks.invite_cb, InviteEvent)
+        self.client.add_event_callback(self.callbacks.redaction_cb, RedactionEvent)
 
         sync_task = asyncio.create_task(self.watch_for_sync(self.client.synced))
         event_loop = asyncio.create_task(self.event_loop())