diff --git a/lib/README b/lib/README
index a68e37b0..dacd3fd6 100644
--- a/lib/README
+++ b/lib/README
@@ -84,3 +84,11 @@ The kconfiglib directory contains code from:
 version v14.1.0 (061e71f7d78cb057762d88de088055361863deff). It has
 been modified to always emit symbols and to simplify the "menuconfig"
 screens. See kconfiglib.patch for the modifications.
+
+The fatfs directory contains code from:
+  http://elm-chan.org/fsw/ff/00index_e.html
+version R0.14a (extracted 20210116).  The configuration (ffconf.h)
+has been modfied to enable the US code page (437) and enable label
+support.  The file "diskio.c" in the original archive is not included
+as it is only serves as an example for how to implement the media api
+callbacks.