diff --git a/federationapi/api/api.go b/federationapi/api/api.go
index 417b08521..1f1ce71a4 100644
--- a/federationapi/api/api.go
+++ b/federationapi/api/api.go
@@ -72,12 +72,19 @@ type RoomserverFederationAPI interface {
 }
 
 type P2PFederationAPI interface {
-	// Relay Server sync api used in the pinecone demos.
+	// Get the relay servers associated for the given server.
 	P2PQueryRelayServers(
 		ctx context.Context,
 		request *P2PQueryRelayServersRequest,
 		response *P2PQueryRelayServersResponse,
 	) error
+
+	// Add relay server associations to the given server.
+	P2PAddRelayServers(
+		ctx context.Context,
+		request *P2PAddRelayServersRequest,
+		response *P2PAddRelayServersResponse,
+	) error
 }
 
 // KeyserverFederationAPI is a subset of gomatrixserverlib.FederationClient functions which the keyserver
@@ -256,3 +263,11 @@ type P2PQueryRelayServersRequest struct {
 type P2PQueryRelayServersResponse struct {
 	RelayServers []gomatrixserverlib.ServerName
 }
+
+type P2PAddRelayServersRequest struct {
+	Server       gomatrixserverlib.ServerName
+	RelayServers []gomatrixserverlib.ServerName
+}
+
+type P2PAddRelayServersResponse struct {
+}
diff --git a/federationapi/internal/perform.go b/federationapi/internal/perform.go
index 552942f28..cfc96cdb0 100644
--- a/federationapi/internal/perform.go
+++ b/federationapi/internal/perform.go
@@ -840,6 +840,21 @@ func (r *FederationInternalAPI) P2PQueryRelayServers(
 	return nil
 }
 
+// P2PAddRelayServers implements api.FederationInternalAPI
+func (r *FederationInternalAPI) P2PAddRelayServers(
+	ctx context.Context,
+	request *api.P2PAddRelayServersRequest,
+	response *api.P2PAddRelayServersResponse,
+) error {
+	logrus.Infof("Adding relay servers for: %s", request.Server)
+	err := r.db.P2PAddRelayServersForServer(ctx, request.Server, request.RelayServers)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (r *FederationInternalAPI) shouldAttemptDirectFederation(
 	destination gomatrixserverlib.ServerName,
 ) bool {
diff --git a/federationapi/inthttp/client.go b/federationapi/inthttp/client.go
index 6130a567d..e6f42335d 100644
--- a/federationapi/inthttp/client.go
+++ b/federationapi/inthttp/client.go
@@ -25,6 +25,7 @@ const (
 	FederationAPIPerformBroadcastEDUPath           = "/federationapi/performBroadcastEDU"
 	FederationAPIPerformWakeupServers              = "/federationapi/performWakeupServers"
 	FederationAPIQueryRelayServers                 = "/federationapi/queryRelayServers"
+	FederationAPIAddRelayServers                   = "/federationapi/addRelayServers"
 
 	FederationAPIGetUserDevicesPath      = "/federationapi/client/getUserDevices"
 	FederationAPIClaimKeysPath           = "/federationapi/client/claimKeys"
@@ -522,3 +523,14 @@ func (h *httpFederationInternalAPI) P2PQueryRelayServers(
 		h.httpClient, ctx, request, response,
 	)
 }
+
+func (h *httpFederationInternalAPI) P2PAddRelayServers(
+	ctx context.Context,
+	request *api.P2PAddRelayServersRequest,
+	response *api.P2PAddRelayServersResponse,
+) error {
+	return httputil.CallInternalRPCAPI(
+		"AddRelayServers", h.federationAPIURL+FederationAPIAddRelayServers,
+		h.httpClient, ctx, request, response,
+	)
+}