diff --git a/libs/langchain/langchain/prompts/chat.py b/libs/langchain/langchain/prompts/chat.py
index 69633610b84..dafb6863179 100644
--- a/libs/langchain/langchain/prompts/chat.py
+++ b/libs/langchain/langchain/prompts/chat.py
@@ -220,7 +220,10 @@ class SystemMessagePromptTemplate(BaseStringMessagePromptTemplate):
 
 
 class ChatPromptValue(PromptValue):
-    """Chat prompt value."""
+    """Chat prompt value.
+    
+    A type of a prompt value that is built from messages.
+    """
 
     messages: List[BaseMessage]
     """List of messages."""