diff --git a/src/net.h b/src/net.h
--- a/src/net.h
+++ b/src/net.h
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2016 The Bitcoin Core developers
+// Copyright (c) 2009-2019 The Bitcoin Core developers
 // Copyright (c) 2017-2019 The Bitcoin developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -570,6 +570,7 @@
 extern std::map<CNetAddr, LocalServiceInfo>
     mapLocalHost GUARDED_BY(cs_mapLocalHost);
 
+extern const std::string NET_MESSAGE_COMMAND_OTHER;
 // Command, total bytes
 typedef std::map<std::string, uint64_t> mapMsgCmdSize;
 
diff --git a/src/net.cpp b/src/net.cpp
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2016 The Bitcoin Core developers
+// Copyright (c) 2009-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -78,7 +78,7 @@
     BF_REPORT_ERROR = (1U << 1),
 };
 
-const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
+const std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
 
 // SHA256("netgroup")[0:8]
 static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL;
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -147,13 +147,24 @@
                 "    \"minfeefilter\": n,         (numeric) The minimum fee "
                 "rate for transactions this peer accepts\n"
                 "    \"bytessent_per_msg\": {\n"
-                "       \"addr\": n,              (numeric) The total bytes "
+                "       \"msg\": n,               (numeric) The total bytes "
                 "sent aggregated by message type\n"
+                "                               When a message type is not "
+                "listed in this json object, the bytes sent are 0.\n"
+                "                               Only known message types can "
+                "appear as keys in the object.\n"
                 "       ...\n"
                 "    },\n"
                 "    \"bytesrecv_per_msg\": {\n"
-                "       \"addr\": n,              (numeric) The total bytes "
+                "       \"msg\": n,               (numeric) The total bytes "
                 "received aggregated by message type\n"
+                "                               When a message type is not "
+                "listed in this json object, the bytes received are 0.\n"
+                "                               Only known message types can "
+                "appear as keys in the object and all bytes received of "
+                "unknown message types are listed under '" +
+                NET_MESSAGE_COMMAND_OTHER +
+                "'.\n"
                 "       ...\n"
                 "    }\n"
                 "  }\n"
@@ -233,7 +244,7 @@
         obj.pushKV("minfeefilter", ValueFromAmount(stats.minFeeFilter));
 
         UniValue sendPerMsgCmd(UniValue::VOBJ);
-        for (const mapMsgCmdSize::value_type &i : stats.mapSendBytesPerMsgCmd) {
+        for (const auto &i : stats.mapSendBytesPerMsgCmd) {
             if (i.second > 0) {
                 sendPerMsgCmd.pushKV(i.first, i.second);
             }
@@ -241,7 +252,7 @@
         obj.pushKV("bytessent_per_msg", sendPerMsgCmd);
 
         UniValue recvPerMsgCmd(UniValue::VOBJ);
-        for (const mapMsgCmdSize::value_type &i : stats.mapRecvBytesPerMsgCmd) {
+        for (const auto &i : stats.mapRecvBytesPerMsgCmd) {
             if (i.second > 0) {
                 recvPerMsgCmd.pushKV(i.first, i.second);
             }