diff --git a/TODO b/TODO
index 1f3440af..897c7cb1 100644
--- a/TODO
+++ b/TODO
@@ -5,13 +5,17 @@ This is a list of possible TODO for SnapRAID. The order is not relevant.
 
 * Easy way to find duplicates using the computed hash.
 
+* Easy way to find files using a specified block.
+
+* Reduce memory occupation removing the flag field in the block structure.
+
 * Add RAID6 redundancy support.
 There is the very good raid6 library from H. Peter Anvin (hpa) in the Linux Kernel ready to use:
 See:
 http://kernel.org/pub/linux/kernel/people/hpa/raid6.pdf
 http://lxr.linux.no/#linux+v2.6.38/lib/raid6
 
-* Go multithread. We can do it when reading the new state (scan.c) and when syncing (sync.c)
+* Go multithread to speed up the MD5 computation. We can do it when syncing and checking.
 
 * Use the O_NOATIME flag if run as 'root'.
 Anyway a better solution is to mount the disk with the "noatime" and "nodiratime" options.