diff --git a/cmd/rollcall/rackctl.go b/cmd/rollcall/rackctl.go
index b96588f..272b258 100644
--- a/cmd/rollcall/rackctl.go
+++ b/cmd/rollcall/rackctl.go
@@ -42,7 +42,7 @@ type RackController struct {
 	Name           string      `json:"name"`
 	URL            string      `json:"url"`               // how machines reach it, e.g. http://10.213.78.1
 	TLSURL         string      `json:"tls_url,omitempty"` // the same host over HTTPS, when it serves it (agents)
-	Kind           string      `json:"kind"` // embedded | remote
+	Kind           string      `json:"kind"`              // embedded | remote
 	Version        string      `json:"version"`
 	Arch           string      `json:"arch,omitempty"` // GOARCH, for self-update
 	Interfaces     []RackIface `json:"interfaces"`