diff --git a/configs/sama5d3x-ek/README.txt b/configs/sama5d3x-ek/README.txt
index 8350efc23d5..7904a6c9156 100644
--- a/configs/sama5d3x-ek/README.txt
+++ b/configs/sama5d3x-ek/README.txt
@@ -1466,7 +1466,8 @@ NAND Support
 
     Another option is Smart FS.  Smart FS is another small file system
     designed to work with FLASH.  Properties:  It does support some wear-
-    leveling, but like FAT, cannot handle bad blocks.
+    leveling like NXFFS, but like FAT, cannot handle bad blocks and like
+    NXFFS, it will try to re-write erased bits.
 
     Using NAND with NXFFS
     ---------------------