diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index 75214ce83..b7b216188 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -1484,6 +1484,8 @@ const (
 
 	CapabilityFileSharing = "https://tailscale.com/cap/file-sharing"
 	CapabilityAdmin       = "https://tailscale.com/cap/is-admin"
+	CapabilitySSH         = "https://tailscale.com/cap/ssh"         // feature enabled/available
+	CapabilitySSHRuleIn   = "https://tailscale.com/cap/ssh-rule-in" // some SSH rule reach this node
 
 	// Inter-node capabilities.