diff --git a/EventFilter/Utilities/interface/FastMonitoringService.h b/EventFilter/Utilities/interface/FastMonitoringService.h
index b20a1107d37d8..347eb77a33923 100644
--- a/EventFilter/Utilities/interface/FastMonitoringService.h
+++ b/EventFilter/Utilities/interface/FastMonitoringService.h
@@ -262,6 +262,7 @@ namespace evf{
       std::string pathLegendFile_;
       std::string pathLegendFileJson_;
       bool pathLegendWritten_ = false;
+      unsigned int nOutputModules_ =0;
 
       std::atomic<bool> monInit_;
       bool exception_detected_ = false;
diff --git a/EventFilter/Utilities/src/FastMonitoringService.cc b/EventFilter/Utilities/src/FastMonitoringService.cc
index a476ad61f26cd..71ca199c96220 100644
--- a/EventFilter/Utilities/src/FastMonitoringService.cc
+++ b/EventFilter/Utilities/src/FastMonitoringService.cc
@@ -21,6 +21,7 @@
 constexpr double throughputFactor() {return (1000000)/double(1024*1024);}
 
 #define NRESERVEDMODULES 33
+#define NSPECIALMODULES 7
 #define NRESERVEDPATHS 1
 
 namespace evf{
@@ -100,9 +101,13 @@ namespace evf{
     for(int i = 0; i < encModule_.current_; i++)
        legendaVector.append(Json::Value(((const edm::ModuleDescription *)(encModule_.decode(i)))->moduleLabel()));
     Json::Value valReserved(NRESERVEDMODULES);
+    Json::Value valSpecial(NSPECIALMODULES);
+    Json::Value valOutputModules(nOutputModules_);
     Json::Value moduleLegend;
     moduleLegend["names"]=legendaVector;
     moduleLegend["reserved"]=valReserved;
+    moduleLegend["special"]=valSpecial;
+    moduleLegend["output"]=valOutputModules;
     Json::StyledWriter writer;
     return writer.write(moduleLegend);
   }
@@ -279,8 +284,10 @@ namespace evf{
     //build a map of modules keyed by their module description address
     //here we need to treat output modules in a special way so they can be easily singled out
     if(desc.moduleName() == "Stream" || desc.moduleName() == "ShmStreamConsumer" || desc.moduleName() == "EvFOutputModule" ||
-       desc.moduleName() == "EventStreamFileWriter" || desc.moduleName() == "PoolOutputModule")
+       desc.moduleName() == "EventStreamFileWriter" || desc.moduleName() == "PoolOutputModule") {
       encModule_.updateReserved((void*)&desc);
+      nOutputModules_++;
+    }
     else
       encModule_.update((void*)&desc);
   }