Clarify README

README.md

@@ -6,8 +6,9 @@ to [sydent](https://github.com/matrix-org/sydent) and an external validation imp
 [Identity Service API](http://matrix.org/docs/spec/identity_service/unstable.html).
 
 # Scope
-mxisd is a read-only Identity Server for corporate environments.  
-It provides a cascading lookup using LDAP then other identity servers, including the central Matrix servers.
+mxisd is a federated Matrix Identity Server following a cascading lookup model, using LDAP then other identity servers, including the central Matrix servers.
+
+mxisd is currently read-only, implementation to bind 3PID will follow shortly.
 
 ## Contact
 If you need help, want to report a bug or just say hi, you can reach us at [#mxisd:kamax.io](https://matrix.to/#/#mxisd:kamax.io)
@@ -18,15 +19,17 @@ For more high-level discussion about the Identity Server architecture/API, go to
 Default Lookup strategy will use a priority order and a configurable recursive/local type of request.
 
 ### E-mail
-Given the 3PID `john.doe@example.org`, the following could be performed until a mapping is found:
-- LDAP: lookup the Matrix ID (partial or complete) from a configurable attribute.
+Given the 3PID `john.doe@example.org`, the following will be performed until a mapping is found:
+- LDAP: lookup the Matrix ID (partial or complete) from a configurable attribute using a dedicated query.
 - DNS: lookup another Identity Server using the domain part of an e-mail and:
   - Look for a SRV record under `_matrix-identity._tcp.example.org`
   - Lookup using the base domain name `example.org`
 - Forwarder: Proxy the request to other configurable identity servers.
 
 ### Phone number
-To be implemented once a formal spec is written by the Matrix people.
+Given the phone number `+123456789`, the following lookup logic will be performed:
+- LDAP: lookup the Matrix ID (partial or complete) from a configurable attribute using a dedicated query.
+- Forwarder: Proxy the request to other configurable identity servers.
 
 # Quick start
 ## Requirements
@@ -63,7 +66,8 @@ curl "http://localhost:8090/_matrix/identity/api/v1/lookup?medium=email&address=
 
 If you plan on testing the integration with a homeserver, you will need to run an HTTPS reverse proxy in front of it
 as the reference Home Server implementation [synapse](https://github.com/matrix-org/synapse) requires a HTTPS connection
-to an ID server.
+to an ID server.  
+See the [Integration section](https://github.com/kamax-io/mxisd#integration) for more details.
 
 # Install
 After [building](#build) the software, run all the following commands as `root` or using `sudo`