diff --git a/.gitignore b/.gitignore
index bf37d80..1cbca14 100644
--- a/.gitignore
+++ b/.gitignore
@@ -138,3 +138,9 @@ log/
 *.srt
 *.txt
 *.bin
+*.epub
+
+# For markdown files in user directories
+.cursorrules
+books/
+prompts/
diff --git a/README.md b/README.md
index 1c28fb6..a9f86c0 100644
--- a/README.md
+++ b/README.md
@@ -167,6 +167,21 @@ bbook --book_name test_books/animal_farm.epub --openai_key ${openai_key} --test
   - If you don't need to set the `system` role content, you can simply set it up like this: `--prompt "Translate {text} to {language}."` or `--prompt prompt_template_sample.txt` (example of a text file can be found at [./prompt_template_sample.txt](./prompt_template_sample.txt)).
 
   - If you need to set the `system` role content, you can use the following format: `--prompt '{"user":"Translate {text} to {language}", "system": "You are a professional translator."}'` or `--prompt prompt_template_sample.json` (example of a JSON file can be found at [./prompt_template_sample.json](./prompt_template_sample.json)).
+  
+  - You can now use [PromptDown](https://github.com/btfranklin/promptdown) format (`.md` files) for more structured prompts: `--prompt prompt_md.prompt.md`. PromptDown supports both traditional system messages and developer messages (used by newer AI models). Example:
+  
+      ```markdown
+      # Translation Prompt
+      
+      ## Developer Message
+      You are a professional translator who specializes in accurate translations.
+      
+      ## Conversation
+      
+      | Role  | Content                                           |
+      |-------|---------------------------------------------------|
+      | User  | Please translate the following text into {language}:\n\n{text} |
+      ```
 
   - You can also set the `user` and `system` role prompt by setting environment variables: `BBM_CHATGPTAPI_USER_MSG_TEMPLATE` and `BBM_CHATGPTAPI_SYS_MSG`.
 
diff --git a/book_maker/cli.py b/book_maker/cli.py
index ce0d58f..001ecfc 100644
--- a/book_maker/cli.py
+++ b/book_maker/cli.py
@@ -13,7 +13,46 @@ def parse_prompt_arg(prompt_arg):
     if prompt_arg is None:
         return prompt
 
-    if not any(prompt_arg.endswith(ext) for ext in [".json", ".txt"]):
+    # Check if it's a path to a markdown file (PromptDown format)
+    if prompt_arg.endswith(".md") and os.path.exists(prompt_arg):
+        try:
+            from promptdown import StructuredPrompt
+            structured_prompt = StructuredPrompt.from_promptdown_file(prompt_arg)
+            
+            # Initialize our prompt structure
+            prompt = {}
+            
+            # Handle developer_message or system_message
+            # Developer message takes precedence if both are present
+            if hasattr(structured_prompt, 'developer_message') and structured_prompt.developer_message:
+                prompt['system'] = structured_prompt.developer_message
+            elif hasattr(structured_prompt, 'system_message') and structured_prompt.system_message:
+                prompt['system'] = structured_prompt.system_message
+            
+            # Extract user message from conversation
+            if hasattr(structured_prompt, 'conversation') and structured_prompt.conversation:
+                for message in structured_prompt.conversation:
+                    if message.role.lower() == 'user':
+                        prompt['user'] = message.content
+                        break
+            
+            # Ensure we found a user message
+            if 'user' not in prompt or not prompt['user']:
+                raise ValueError("PromptDown file must contain at least one user message")
+                
+            print(f"Successfully loaded PromptDown file: {prompt_arg}")
+            
+            # Validate required placeholders
+            if any(c not in prompt["user"] for c in ["{text}"]):
+                raise ValueError("User message in PromptDown must contain `{text}` placeholder")
+            
+            return prompt
+        except Exception as e:
+            print(f"Error parsing PromptDown file: {e}")
+            # Fall through to other parsing methods
+    
+    # Existing parsing logic for JSON strings and other formats
+    if not any(prompt_arg.endswith(ext) for ext in [".json", ".txt", ".md"]):
         try:
             # user can define prompt by passing a json string
             # eg: --prompt '{"system": "You are a professional translator who translates computer technology books", "user": "Translate \`{text}\` to {language}"}'
diff --git a/docs/prompt.md b/docs/prompt.md
index 1b2b37c..b27f76d 100644
--- a/docs/prompt.md
+++ b/docs/prompt.md
@@ -19,6 +19,32 @@ To tweak the prompt, use the `--prompt` parameter. Valid placeholders for the `u
 
 You can also set the `user` and `system` role prompt by setting environment variables: `BBM_CHATGPTAPI_USER_MSG_TEMPLATE` and `BBM_CHATGPTAPI_SYS_MSG`.
 
+- You can now use PromptDown format (`.md` files) for more structured prompts: `--prompt prompt_md.prompt.md`
+
+        # Translation Prompt
+        
+        ## System Message
+        You are a professional translator who specializes in accurate translations.
+        
+        ## Conversation
+        
+        | Role  | Content                                  |
+        |-------|------------------------------------------|
+        | User  | Please translate the following text into {language}:\n\n{text} |
+        
+        # OR using Developer Message (for newer AI models)
+        
+        # Translation Prompt
+        
+        ## Developer Message
+        You are a professional translator who specializes in accurate translations.
+        
+        ## Conversation
+        
+        | Role  | Content                                  |
+        |-------|------------------------------------------|
+        | User  | Please translate the following text into {language}:\n\n{text} |
+
 ## Examples
 ```sh
 python3 make_book.py --book_name test_books/animal_farm.epub --prompt prompt_template_sample.txt
diff --git a/prompt_md.prompt.md b/prompt_md.prompt.md
new file mode 100644
index 0000000..8aeddfa
--- /dev/null
+++ b/prompt_md.prompt.md
@@ -0,0 +1,11 @@
+# Translation Prompt
+
+## Developer Message
+
+You are a professional translator who specializes in accurate, natural-sounding translations that preserve the original meaning, tone, and style of the text.
+
+## Conversation
+
+| Role  | Content                                                                   |
+|-------|---------------------------------------------------------------------------|
+| User  | Please translate the following text into {language}:\n\n{text}            |
diff --git a/pyproject.toml b/pyproject.toml
index e85bba7..ea976af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ description = "The bilingual_book_maker is an AI translation tool that uses Chat
 readme = "README.md"
 license = {text = "MIT"}
 dynamic = ["version"]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [
     { name = "yihong0618", email = "zouzou0208@gmail.com" },
 ]
@@ -28,10 +28,12 @@ dependencies = [
     "tiktoken",
     "tqdm",
     "groq>=0.5.0",
+    "promptdown>=0.9.0",
 ]
 
 [project.scripts]
 bbook_maker = "book_maker.cli:main"
+promptdown = "promptdown_cli:main"
 
 [project.urls]
 Homepage = "https://github.com/yihong0618/bilingual_book_maker"
diff --git a/requirements.txt b/requirements.txt
index d8b6382..ebf11b5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,6 +53,7 @@ mdurl==0.1.2
 multidict==6.0.5
 openai==1.30.3
 packaging==24.0
+promptdown==0.9.0
 proto-plus==1.23.0
 protobuf==4.25.3
 pyasn1==0.6.0