diff --git a/metropolis/test/nanoswitch/socks.go b/metropolis/test/nanoswitch/socks.go
index 3ca8e34..a85e9a3 100644
--- a/metropolis/test/nanoswitch/socks.go
+++ b/metropolis/test/nanoswitch/socks.go
@@ -9,6 +9,8 @@
 	"source.monogon.dev/metropolis/pkg/supervisor"
 )
 
+// SOCKSPort is the port at which nanoswitch listens for SOCKS conenctions.
+//
 // ONCHANGE(//metropolis/test/launch/cluster:cluster.go): port must be kept in sync
 const SOCKSPort uint16 = 1080