diff --git a/client/cmdhfmfdes.c b/client/cmdhfmfdes.c
index d3c0577b2..4053d58a9 100644
--- a/client/cmdhfmfdes.c
+++ b/client/cmdhfmfdes.c
@@ -974,7 +974,7 @@ static int CmdHF14ADesInfo(const char *Cmd) {
     if (get_desfire_signature(signature, &signature_len) == PM3_SUCCESS)
         desfire_print_signature(package->uid, signature, signature_len, cardtype);
     else{
-        PrintAndLogEx(WARNING, "--- " _YELLOW_("Couldn't verify signature."));
+        PrintAndLogEx(WARNING, "--- " _YELLOW_("Couldn't verify signature. Unknown public key ?"));
     }
 
     // Master Key settings