diff --git a/methods/did-key/key.go b/methods/did-key/key.go
index 3c39fd7..df9a804 100644
--- a/methods/did-key/key.go
+++ b/methods/did-key/key.go
@@ -52,7 +52,7 @@ func Decode(identifier string) (did.DID, error) {
 }
 
 func FromPublicKey(pub crypto.PublicKey) did.DID {
-	return DidKey{msi: pub.ToPublicKeyMultibase()}
+	return DidKey{msi: pub.ToPublicKeyMultibase(), pubkey: pub}
 }
 
 func FromPrivateKey(priv crypto.PrivateKey) did.DID {
diff --git a/methods/did-key/key_test.go b/methods/did-key/key_test.go
index 59ba571..b39574f 100644
--- a/methods/did-key/key_test.go
+++ b/methods/did-key/key_test.go
@@ -55,6 +55,16 @@ func TestMustParseDIDKey(t *testing.T) {
 	})
 }
 
+func TestFromPublicKey(t *testing.T) {
+	pub, _, err := ed25519.GenerateKeyPair()
+	require.NoError(t, err)
+	dk := didkey.FromPublicKey(pub)
+	require.Equal(t, "did:key:"+pub.ToPublicKeyMultibase(), dk.String())
+	doc, err := dk.Document()
+	require.NoError(t, err)
+	require.NotEmpty(t, doc)
+}
+
 func TestEquivalence(t *testing.T) {
 	did0A, err := did.Parse("did:key:z6Mkod5Jr3yd5SC7UDueqK4dAAw5xYJYjksy722tA9Boxc4z")
 	require.NoError(t, err)