diff --git a/src/gismo_core/abc/bot_service_abc.py b/src/gismo_core/abc/bot_service_abc.py
index 5ce856e..c842923 100644
--- a/src/gismo_core/abc/bot_service_abc.py
+++ b/src/gismo_core/abc/bot_service_abc.py
@@ -1,5 +1,6 @@
 from abc import ABC, abstractmethod
 
+import discord
 from discord.ext import commands
 
 
@@ -13,3 +14,6 @@ class BotServiceABC(ABC, commands.Bot):
 
     @abstractmethod
     async def stop_async(self): pass
+    
+    @abstractmethod
+    async def on_message(self, message: discord.Message): pass