diff --git a/activitystreams/person.go b/activitystreams/person.go
index 4cd1a21..73f95d0 100644
--- a/activitystreams/person.go
+++ b/activitystreams/person.go
@@ -1,34 +1,43 @@
 package activitystreams
 
 type Person struct {
 	BaseObject
 	Inbox             string    `json:"inbox"`
 	Outbox            string    `json:"outbox"`
 	PreferredUsername string    `json:"preferredUsername"`
 	URL               string    `json:"url"`
 	Name              string    `json:"name"`
 	Icon              Image     `json:"icon"`
 	Following         string    `json:"following"`
 	Followers         string    `json:"followers"`
 	Summary           string    `json:"summary"`
 	PublicKey         PublicKey `json:"publicKey"`
 }
 
 func NewPerson(accountRoot string) *Person {
 	p := Person{
 		BaseObject: BaseObject{
 			Type: "Person",
 			Context: []string{
 				"https://www.w3.org/ns/activitystreams",
 			},
 			ID: accountRoot,
 		},
 		URL:       accountRoot,
 		Following: accountRoot + "/following",
 		Followers: accountRoot + "/followers",
 		Inbox:     accountRoot + "/inbox",
 		Outbox:    accountRoot + "/outbox",
 	}
 
 	return &p
 }
+
+func (p *Person) AddPubKey(k []byte) {
+	p.Context = append(p.Context, "https://w3id.org/security/v1")
+	p.PublicKey = PublicKey{
+		ID:           p.ID + "#main-key",
+		Owner:        p.ID,
+		PublicKeyPEM: string(k),
+	}
+}