diff --git a/magic/Magdir/rtf b/magic/Magdir/rtf
index 48a1f28a..0e5b22c4 100644
--- a/magic/Magdir/rtf
+++ b/magic/Magdir/rtf
@@ -92,3 +92,8 @@
 !:ext	pwd/psw/pwt
 >0	use		rtf-info
 
+# https://en.wikipedia.org/wiki/Rich_Text_Format_Directory
+# https://developer.apple.com/documentation/uniformtypeidentifiers/uttype-swift.struct/rtfd
+0	string		rtfd\0\0\0\0		Rich Text Format Directory
+!:ext	rtfd
+