diff --git a/CHANGELOG.md b/CHANGELOG.md
index 94769e3..7b4aaae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # xbotlib x.x.x (UNRELEASED)
 
+- Error out if you don't provide a `react` implementation
+
 # xbotlib 0.2.0 (2021-01-10)
 
 - Refine API for direct/chat responses
diff --git a/xbotlib.py b/xbotlib.py
index 9906e97..68a2abb 100644
--- a/xbotlib.py
+++ b/xbotlib.py
@@ -143,3 +143,7 @@ class Bot(ClientXMPP):
             kwargs["mtype"] = "groupchat"
 
         self.send_message(**kwargs)
+
+    def react(self, message):
+        message = "You need to write your own `react` implementation"
+        raise NotImplementedError(message)