diff --git a/libpurple_to_markdown/__main__.py b/libpurple_to_markdown/__main__.py
index c4ac203..4c6630d 100644
--- a/libpurple_to_markdown/__main__.py
+++ b/libpurple_to_markdown/__main__.py
@@ -1,13 +1,23 @@
 import argparse
 import logging
 from pathlib import Path
+import logging
 
-from . import format_messages, merge_adjacent_messages, parse_messages_in_chat_folder
+from . import (format_messages, merge_adjacent_messages, parse_messages_in_chat_folder, Message)
 
+logger = logging.getLogger(__name__)
+
+def group_messages_by_year(messages: list[Message]) -> dict[int, list[Message]]:
+    by_year = {}
+    for msg in messages:
+        by_year.setdefault(msg.sent_at.year, []).append(msg)
+        del msg
+    return by_year
 
 def parse_args():
     parser = argparse.ArgumentParser()
     parser.add_argument('path', type=Path)
+    parser.add_argument('--output', type=Path)
     return parser.parse_args()
 
 
@@ -16,9 +26,21 @@ def main():
     logging.getLogger().setLevel('INFO')
     args = parse_args()
 
-    messages = parse_messages_in_chat_folder(args.path)
-    messages = merge_adjacent_messages(messages)
-    print(format_messages(messages))
+    server = args.path.parent.name
+    receipient = args.path.name
+
+    all_messages = parse_messages_in_chat_folder(args.path)
+    all_messages = merge_adjacent_messages(all_messages)
+
+    messages_by_year = group_messages_by_year(all_messages)
+
+    for year, messages in messages_by_year.items():
+        output_file = args.output / f'{server} - {receipient} - {year}.md'
+        logger.info("Writing to %s", output_file)
+        with open(output_file, 'w') as f:
+            f.write(format_messages(messages))
+
+        del year, messages, output_file
 
 
 if __name__ == '__main__':