diff --git a/proto/keymanager/v1/keymanager.proto b/proto/keymanager/v1/keymanager.proto
index 296c802..754b93d 100644
--- a/proto/keymanager/v1/keymanager.proto
+++ b/proto/keymanager/v1/keymanager.proto
@@ -71,5 +71,9 @@ message ServerCommand {
 }
 
 message GenerateKeyCmd {
-  string label = 1;
+  string label      = 1;
+  string key_type   = 2; // ed25519 | rsa | ecdsa (default: ed25519)
+  int32  key_size   = 3; // bits; used for rsa and ecdsa
+  string passphrase = 4; // empty = no passphrase
+  string comment    = 5; // embedded in public key
 }