diff --git a/src/init.cpp b/src/init.cpp
index a52603f67..0ee047e59 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -402,7 +402,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-stopafterblockimport", strprintf("Stop running after importing blocks from disk (default: %u)", 0));
     }
     string debugCategories = "addrman, alert, bench, coindb, db, estimatefee, lock, mempool, net, partitioncheck, pow, proxy, prune, "
-                             "rand, reindex, rpc, selectcoins, zrpc, zrpcunsafe (implies zrpc)"; // Don't translate these and qt below
+                             "rand, reindex, rpc, selectcoins, zmq, zrpc, zrpcunsafe (implies zrpc)"; // Don't translate these and qt below
     if (mode == HMM_BITCOIN_QT)
         debugCategories += ", qt";
     strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +