Update README.md

README.md

@@ -59,9 +59,13 @@ This should be fixed in the next release of KoboldCpp, so if you are running a v
 
 ## Prompt template
 
-Just type the prompt!
+Based on the code for the MPT 30B Chat Space, I believe this is the correct prompt template:
+
 ```
-prompt
+<|im_start|>system
+A conversation between a user and an LLM-based AI assistant. The assistant gives helpful and honest answers.<|im_end|>
+<|im_start|>user
+prompt goes here<|im_end|>
 ```
 
 ## A note regarding context length: 8K