diff --git a/spec.txt b/spec.txt
index 3e89c90..d10988c 100644
--- a/spec.txt
+++ b/spec.txt
@@ -453,7 +453,7 @@ Writing a block:
 
 # block file format
 
-An implementation of ilo is free to choose the best approach to
+An implementation is free to choose the best approach to
 implementing the actual block storage. For the reference model,
 a flat file is used, with each block being stored sequentially.
 
@@ -463,3 +463,7 @@ packing or unpacking from memory as needed.
 
 As with the image, the block file in the reference model is
 stored in little endian format.
+
+This is not required. An implementation could store blocks as
+individual files, using a database, or in whatever form the
+implementor desires.