diff --git a/lib/plugins/browsertime/index.js b/lib/plugins/browsertime/index.js
index c28883f44..e55361790 100644
--- a/lib/plugins/browsertime/index.js
+++ b/lib/plugins/browsertime/index.js
@@ -327,6 +327,7 @@ module.exports = {
       }
 
       case 'sitespeedio.summarize': {
+        log.debug('Generate summary metrics from Browsertime');
         const summary = aggregator.summarize();
         if (summary) {
           for (let group of Object.keys(summary.groups)) {
diff --git a/lib/plugins/coach/index.js b/lib/plugins/coach/index.js
index c373017b4..7d7aac9cc 100644
--- a/lib/plugins/coach/index.js
+++ b/lib/plugins/coach/index.js
@@ -1,5 +1,6 @@
 'use strict';
 const aggregator = require('./aggregator');
+const log = require('intel').getLogger('plugin.coach');
 
 const DEFAULT_METRICS_SUMMARY = [
   'score.*',
@@ -57,6 +58,7 @@ module.exports = {
       }
 
       case 'sitespeedio.summarize': {
+        log.debug('Generate summary metrics from the Coach');
         let summary = aggregator.summarize();
         if (summary) {
           for (let group of Object.keys(summary.groups)) {
diff --git a/lib/plugins/pagexray/index.js b/lib/plugins/pagexray/index.js
index 58849c55f..2f4c77ea1 100644
--- a/lib/plugins/pagexray/index.js
+++ b/lib/plugins/pagexray/index.js
@@ -1,6 +1,7 @@
 'use strict';
 const pagexrayAggregator = require('./pagexrayAggregator');
 const pagexray = require('pagexray');
+const log = require('intel').getLogger('plugin.pagexray');
 
 const DEFAULT_PAGEXRAY_PAGESUMMARY_METRICS = [
   'contentTypes',
@@ -88,6 +89,7 @@ module.exports = {
       }
 
       case 'sitespeedio.summarize': {
+        log.debug('Generate summary metrics from PageXray');
         let pagexraySummary = pagexrayAggregator.summarize();
         if (pagexraySummary) {
           for (let group of Object.keys(pagexraySummary.groups)) {