diff --git a/backend/server.js b/backend/server.js
index 0b8db32..2fbb04f 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -34,7 +34,7 @@ const CORS_ORIGINS = process.env.CORS_ORIGINS
 // Allowed file extensions for document uploads (documents only, no executables)
 const ALLOWED_EXTENSIONS = new Set([
     '.pdf', '.png', '.jpg', '.jpeg', '.gif', '.bmp', '.tiff', '.tif',
-    '.txt', '.csv', '.log', '.msg', '.eml',
+    '.txt', '.md', '.csv', '.log', '.msg', '.eml',
     '.doc', '.docx', '.xls', '.xlsx', '.ppt', '.pptx',
     '.odt', '.ods', '.odp',
     '.rtf', '.html', '.htm', '.xml', '.json', '.yaml', '.yml',