diff --git a/cps/__init__.py b/cps/__init__.py
index 1b1fa191..eb94fcfb 100644
--- a/cps/__init__.py
+++ b/cps/__init__.py
@@ -56,7 +56,7 @@ mimetypes.add_type('application/xhtml+xml', '.xhtml')
 mimetypes.add_type('application/epub+zip', '.epub')
 mimetypes.add_type('application/epub+zip', '.kepub')
 mimetypes.add_type('application/fb2+zip', '.fb2')
-mimetypes.add_type('application/octet-stream', '.mobi')
+mimetypes.add_type('application/x-mobipocket-ebook', '.mobi')
 mimetypes.add_type('application/octet-stream', '.prc')
 mimetypes.add_type('application/vnd.amazon.ebook', '.azw')
 mimetypes.add_type('application/x-mobi8-ebook', '.azw3')
@@ -78,6 +78,7 @@ mimetypes.add_type('application/ogg', '.oga')
 mimetypes.add_type('text/css', '.css')
 mimetypes.add_type('application/x-ms-reader', '.lit')
 mimetypes.add_type('text/javascript; charset=UTF-8', '.js')
+mimetypes.add_type('text/rtf', '.rtf')
 
 log = logger.create()