diff --git a/README.MD b/README.MD
index 777d90a..dc76499 100644
--- a/README.MD
+++ b/README.MD
@@ -53,9 +53,9 @@ Keep it safe and secure.
 DO NOT USE THIS AS YOUR PASSPHRASE.
 (And no, this is NOT my passphrase, it is some random garbage)
 
-### backup_exclude.txt
-
-Todo
+### backup_exclude.txt  
+A file containing files/directories that should NOT be included in the backup, this can be tmpfiles, virtual filesystems or mounted network devices that might not always be thre or inflate the backup size.  
+A good "default" exclude file is included in ```backup_exclude.txt.sample``` 
 
 ### init_backup.sh