Update README.md

README.md

@@ -49,4 +49,14 @@ The model is available in quantized formats:
 
 ## Suggested Prompt Format
 
-Gemma Instruct Prompt Format
+Gemma Instruct Prompt Format
+
+Since Gemma does not have system prompts, put the character descriptions in the first turn like on Mistral models.
+
+It is trained with <instructions> and <end_of_instructions> that enclose the system prompt in the first user message.
+
+```
+<bos><start_of_turn>user
+<instructions>You are a (character description)<end_of_instructions>\n\nHello!<end_of_turn>
+<start_of_turn>model
+```