add notes to the compatibility section

Author: hacdias

src/ipips/ipip-0417.md

@@ -30,7 +30,7 @@ across different systems.
 ## Detailed design
 
 Add `/routing/v1/peers/{peer-id}` to the existing :cite[http-routing-v1] specification,
-as well as the new Peer schema.
+as well as the new Peer schema, that replaces the existing "known transfer protocols".
 
 ## Design rationale
 
@@ -45,7 +45,12 @@ routing.
 
 ### Compatibility
 
-See the "Compatibility" section of :cite[ipip-0337].
+The section "Known Transfer Protocols" has been removed and replaced by a "Known Schemas"
+section. Before, we used to have protocol specific schemas, such as `bitswap` and `graphsync-filecoinv1`.
+The usage of the removed schemas is no longer encouraged. Instead, clients and servers
+SHOULD be updated to use the new, more generic, `peer` schema.
+
+See more in the "Compatibility" section of :cite[ipip-0337].
 
 ### Security