add -pushversion help message

src/init.cpp

@@ -524,6 +524,11 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-masternodeaddr=<n>", strprintf("Set external address:port to get to this masternode (example: %s)", "128.127.106.235:51472"));
     strUsage += HelpMessageOpt("-budgetvotemode=<mode>", "Change automatic finalized budget voting behavior. mode=auto: Vote for only exact finalized budget match to my generated budget. (string, default: auto)");
     strUsage += HelpMessageOpt("-mnoperatorprivatekey=<WIF>", "Set the masternode operator private key. Only valid with -masternode=1. When set, the masternode acts as a deterministic masternode.");
+    if (showDebug) {
+        strUsage += HelpMessageOpt("-pushversion",
+                                   strprintf("Modifies the mnauth serialization if the version is lower than %d."
+                                             "testnet/regtest only; ", MNAUTH_NODE_VER_VERSION));
+    }
 
     strUsage += HelpMessageGroup("Node relay options:");
     if (showDebug) {