diff --git a/README.md b/README.md
index 3647c8a..35b3232 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ Look at adding units.
 
 ### Hash String
 
-The hash string is name of hash followed by a colon followed by the hex string.
+The hash string is name of hash (hash type) followed by a colon followed by the hex string (hash value).
 
 The list of valid hashes is:
 - sha256
@@ -49,6 +49,10 @@ The list of valid hashes is:
 
 A reference is the UUID optionally followed by two dashes (--) followed by the modified date of the object.  The modified date is neccessary in some cases to know what version of the object is being referenced.
 
+### Hashes
+
+For storing multiple hashes, a hashes type is used.  This will be serialized as a list of hash strings.  The list is used to reduce serialization overhead, and when loaded, may be parsed out into a dictionary for faster lookup.  Only one hash string of each hash type is allowed.  If there are duplicates, the object is invalid and MUST be ignored.
+
 ## Objects
 
 These are the nodes that contain a majority of the data.