diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -88,6 +88,9 @@
         return true;
     } else {
         LogPrint(BCLog::ZMQ, "zmq: Reusing socket for address %s\n", address);
+        LogPrint(BCLog::ZMQ,
+                 "zmq: Outbound message high water mark for %s at %s is %d\n",
+                 type, address, outbound_message_high_water_mark);
 
         psocket = i->second->psocket;
         mapPublishNotifiers.insert(std::make_pair(address, this));