Document change in datagram signatures

i2p2www/pages/site/docs/spec/datagrams.html

@@ -76,8 +76,11 @@ from      :: a <a href="{{ site_url('docs/spec/common-structures') }}#struct_Des
 signature :: a <a href="{{ site_url('docs/spec/common-structures') }}#type_Signature">Signature</a>
              Signature type must match the signing public key type in the 'from' Destination.
              length: 40+ bytes, as implied by the Signature type.
-             The <a href="{{ site_url('docs/spec/common-structures') }}#type_Signature">signature</a> of the hash of the payload, which may be verified by the
-             signing public key of the 'from' Destination. The hash algorithm is implied by the Signature type.
+             For the default DSA_SHA1 key type:
+                The DSA <a href="{{ site_url('docs/spec/common-structures') }}#type_Signature">signature</a> of the SHA-256 hash of the payload.
+             For other key types:
+                The <a href="{{ site_url('docs/spec/common-structures') }}#type_Signature">signature</a> of the payload.
+             The signature may be verified by the signing public key of the 'from' Destination.
 
 payload ::  The data
             Length: 0 to ~31.5 KB (see notes)
@@ -99,6 +102,9 @@ currently limit messages to about 32 KB, so the data length here is limited to a
 See <a href={{ dgrams }}">important notes</a> about the reliability of large datagrams.
 For best results, limit the payload to about 10 KB or less.
 {%- endtrans %}</li>
+<li>{% trans -%}
+Signatures for types other than DSA_SHA1 were redefined in release 0.9.14.
+{%- endtrans %}</li>
 </ul>