diff --git a/nugget/include/app_nugget.h b/nugget/include/app_nugget.h
index f713299..d6342ff 100644
--- a/nugget/include/app_nugget.h
+++ b/nugget/include/app_nugget.h
@@ -521,7 +521,7 @@
  * nonce || gsa_psk_state)
  */
 struct verify_psk_request {
-    char header[VERIFY_PSK_REQ_HEADER_SIZE];
+    uint8_t header[VERIFY_PSK_REQ_HEADER_SIZE];
     uint8_t version;
     uint8_t nonce[VERIFY_PSK_NONCE_SIZE];
     uint8_t gsa_psk_state;
@@ -540,11 +540,21 @@
  * Verify GSA GSC pre-shared key command
  *
  * @param args         struct verify_psk_request
- * @param arg_len      63 bytes
+ * @param arg_len      83 bytes
  * @param reply        psk verification result
  * @param reply_len    1 bytes
  */
 
+#define NUGGET_PARAM_SECURE_TRANSPORT_HANDSHAKE 0x0019
+/*
+ * Secure transport handshak (noise protocol) command
+ *
+ * @param args         GSA EC public_key + AES_GCM256("MSGA") + AES_GSC_TAG
+ * @param arg_len      64 + 4 + 16 bytes = 84
+ * @param reply        GSC EC public_key + AES_GCM256("MSGB") + AES_GSC_TAG
+ * @param reply_len    64 + 4 + 16 bytes = 84
+ */
+
 /****************************************************************************/
 /* Test related commands */