Add to docs

README.md

@@ -133,8 +133,9 @@ pipeline("the secret to baking a really good cake is ")
 To chat with a model, the usage pattern is the same. The only difference is you need to construct a chat history (the input to `Pipeline`) between you and the system.
 
 > [!TIP]
-> You can also chat with a model directly from the command line.
+> You can also chat with a model directly from the command line. Please make sure you have the `chat` extra installed:
 > ```shell
+> pip install .[chat]  # or pip install transformers[chat]
 > transformers chat Qwen/Qwen2.5-0.5B-Instruct
 > ```
 

docs/source/en/conversations.md

@@ -31,6 +31,13 @@ This guide shows you how to quickly start chatting with Transformers from the co
 ### Interactive chat session
 
 After you've [installed Transformers](./installation.md), chat with a model directly from the command line as shown below. It launches an interactive session with a model, with a few base commands listed at the start of the session.
+For this to work, you need to have installed the chat extra:
+
+```bash
+pip install transformers[chat]
+```
+
+You can then launch an interactive session as follows:
 
 ```bash
 transformers chat Qwen/Qwen2.5-0.5B-Instruct