diff --git a/go/vt/proto/query/query.pb.go b/go/vt/proto/query/query.pb.go
index abc0717206..3be9a634e5 100644
--- a/go/vt/proto/query/query.pb.go
+++ b/go/vt/proto/query/query.pb.go
@@ -799,10 +799,16 @@ type RealtimeStats struct {
 	// we do not send queries to servers that are not healthy.
 	HealthError string `protobuf:"bytes,1,opt,name=health_error" json:"health_error,omitempty"`
 	// seconds_behind_master is populated for slaves only. It indicates
-	// how far behind on replication a slave currently is.  It is used
+	// how far behind on (MySQL) replication a slave currently is.  It is used
 	// by clients for subset selection (so we don't try to send traffic
 	// to tablets that are too far behind).
+	// TODO(mberlin): Let's switch it to int64 instead?
 	SecondsBehindMaster uint32 `protobuf:"varint,2,opt,name=seconds_behind_master" json:"seconds_behind_master,omitempty"`
+	// filtered_replication_synced_until_timestamp is populated for the receiving
+	// master of an ongoing filtered replication only.
+	// It is used to find out how far the receiving master lags behind the
+	// source shard.
+	FilteredReplicationSyncedUntilTimestamp int64 `protobuf:"varint,4,opt,name=filtered_replication_synced_until_timestamp" json:"filtered_replication_synced_until_timestamp,omitempty"`
 	// cpu_usage is used for load-based balancing
 	CpuUsage float64 `protobuf:"fixed64,3,opt,name=cpu_usage" json:"cpu_usage,omitempty"`
 }
diff --git a/proto/query.proto b/proto/query.proto
index 73552eb923..42591d647d 100644
--- a/proto/query.proto
+++ b/proto/query.proto
@@ -281,12 +281,21 @@ message RealtimeStats {
   // we do not send queries to servers that are not healthy.
   string health_error = 1;
 
+  // TODO(mberlin): Add an health error for filtered replication?
+
   // seconds_behind_master is populated for slaves only. It indicates
-  // how far behind on replication a slave currently is.  It is used
+  // how far behind on (MySQL) replication a slave currently is.  It is used
   // by clients for subset selection (so we don't try to send traffic
   // to tablets that are too far behind).
+  // TODO(mberlin): Let's switch it to int64 instead?
   uint32 seconds_behind_master = 2;
 
+  // filtered_replication_synced_until_timestamp is populated for the receiving
+  // master of an ongoing filtered replication only.
+  // It is used to find out how far the receiving master lags behind the
+  // source shard.
+  int64 filtered_replication_synced_until_timestamp = 4;
+
   // cpu_usage is used for load-based balancing
   double cpu_usage = 3;
 }