Clarify format of Multihash values.

index.html

@@ -1329,11 +1329,11 @@ <h2>Multibase</h2>
           <h2>Multihash</h2>
 
           <p>
-A Multihash value starts with a binary header, which identifies the specific
-cryptographic hash algorithm and parameters used to generate the digest,
-followed by the cryptographic digest value. The normative Multihash header
-values defined by this specification, and their associated output sizes and
-associated specifications, are provided below:
+A Multihash value starts with a binary header, which includes 1) an identifier
+for the specific cryptographic hash algorithm, 2) the length of the
+cryptographic hash, and 3) the value of the cryptographic hash. The normative
+Multihash header values defined by this specification, and their associated
+output sizes and associated specifications, are provided below:
           </p>
 
           <table class="simple">
@@ -1383,15 +1383,18 @@ <h2>Multihash</h2>
           </p>
 
           <p>
-To encode to a Multihash value, an implementation MUST prepend the associated
-Multihash header value to the cryptographic hash value.
+To encode to a Multihash value, an implementation MUST concatenate the
+associated Multihash header, the cryptographic hash length, and the
+cryptographic hash value, in that order.
           </p>
 
           <p>
-To decode a Multihash value, an implementation MUST remove the prepended
+To decode a Multihash value, an implementation MUST 1) remove the prepended
 Multihash header value, which identifies the type of cryptographic hashing
-algorithm as well as its output length, leaving the raw cryptographic hash
-value which MUST match the output length associated with the Multihash header.
+algorithm, 2) remove the output length, and 3) extract the raw cryptographic
+hash value which MUST match the expected output length associated with the
+Multihash header as well as the output length provided in the Multihash
+value itself.
           </p>
 
         </section>