diff --git a/node/builder.go b/node/builder.go
index ddba82112..1e4ea0400 100644
--- a/node/builder.go
+++ b/node/builder.go
@@ -67,9 +67,10 @@ var (
 	ConnectionManagerKey = special{9}  // Libp2p option
 	AutoNATSvcKey        = special{10} // Libp2p option
 	BandwidthReporterKey = special{11} // Libp2p option
-	ConnGaterKey         = special{12} // libp2p option
+	ConnGaterKey         = special{12} // Libp2p option
 	DAGStoreKey          = special{13} // constructor returns multiple values
 	ResourceManagerKey   = special{14} // Libp2p option
+	UserAgentKey         = special{15} // Libp2p option
 )
 
 type invoke int
diff --git a/node/modules/lp2p/host.go b/node/modules/lp2p/host.go
index 2d441eb3f..f529574f7 100644
--- a/node/modules/lp2p/host.go
+++ b/node/modules/lp2p/host.go
@@ -69,6 +69,13 @@ func Host(mctx helpers.MetricsCtx, lc fx.Lifecycle, params P2PHostIn) (RawHost,
 	return h, nil
 }
 
+func UserAgentOption(agent string) func() (opts Libp2pOpts, err error) {
+	return func() (opts Libp2pOpts, err error) {
+		opts.Opts = append(opts.Opts, libp2p.UserAgent(agent))
+		return
+	}
+}
+
 func MockHost(mn mocknet.Mocknet, id peer.ID, ps peerstore.Peerstore) (RawHost, error) {
 	return mn.AddPeerWithPeerstore(id, ps)
 }