diff --git a/langchain/agents/conversational_chat/prompt.py b/langchain/agents/conversational_chat/prompt.py
index 59d73c3a..3d1799ac 100644
--- a/langchain/agents/conversational_chat/prompt.py
+++ b/langchain/agents/conversational_chat/prompt.py
@@ -18,7 +18,7 @@ Markdown code snippet formatted in the following schema:
 
 ```json
 {{{{
-    "action": string \\ The action to take. Must be one of {tool_names}
+    "action": string, \\ The action to take. Must be one of {tool_names}
     "action_input": string \\ The input to the action
 }}}}
 ```