diff --git a/README.md b/README.md
index ef508cd..d0f79e0 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,6 @@
 # sendgrid-stats-exporter
 
-## Overview
-
-(TBW)
-
+Prometheus exporter for SendGrid daily metrics exposed by SendGrid Stats API(v3).
 
     +---------------------------+                          +------------+                        +--------------+
     |  SendGrid Stats API (v3)  |---(collect /v3/stats)--->|  exporter  |<---(scrape /metrics)---|  Prometheus  |
@@ -50,26 +47,26 @@ Name     | Description
 
 Name     | Description
 ---------|------------
-blocks | dummy
-bounce_drops | dummy
-bounces | dummy
-deferred | dummy
-delivered | dummy
-invalid_emails | dummy
-processed | dummy
-requests | dummy
-spam_report_drops | dummy
-spam_reports | dummy
-unique_clicks | dummy
-unique_opens | dummy
-unsubscribe_drops | dummy
-unsubscribes | dummy
+blocks | The number of emails that were not allowed to be delivered by ISPs.
+bounce_drops | The number of emails that were dropped because of a bounce.
+bounces | The number of emails that bounced instead of being delivered.
+deferred | The number of emails that temporarily could not be delivered.
+delivered | The number of emails SendGrid was able to confirm were actually delivered to a recipient.
+invalid_emails | The number of recipients who had malformed email addresses or whose mail provider reported the address as invalid.
+processed | Requests from your website, application, or mail client via SMTP Relay or the API that SendGrid processed.
+requests | The number of emails that were requested to be delivered.
+spam_report_drops | The number of emails that were dropped due to a recipient previously marking your emails as spam.
+spam_reports | The number of recipients who marked your email as spam.
+unique_clicks | The number of unique recipients who clicked links in your emails.
+unique_opens | The number of unique recipients who opened your emails.
+unsubscribe_drops | The number of emails dropped due to a recipient unsubscribing from your emails.
+unsubscribes | The number of recipients who unsubscribed from your emails.
 
 ### Running with Docker
 
-(TBW)
-
- - docker run
+```
+$ docker run -d -p 9154:9154 chatwork/sendgrid-stats-exporter
+```
  
 #### Running with `docker-compose`
 
diff --git a/collect.go b/collect.go
index 3742261..b16b304 100644
--- a/collect.go
+++ b/collect.go
@@ -1,12 +1,15 @@
 package main
 
 import (
+	"github.com/go-kit/kit/log"
+	"github.com/go-kit/kit/log/level"
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/log"
 	"time"
 )
 
 type Collector struct {
+	logger log.Logger
+
 	blocks           *prometheus.Desc
 	bounceDrops      *prometheus.Desc
 	bounces          *prometheus.Desc
@@ -25,8 +28,10 @@ type Collector struct {
 	unsubscribes     *prometheus.Desc
 }
 
-func collector() *Collector {
+func collector(logger log.Logger) *Collector {
 	return &Collector{
+		logger: logger,
+
 		blocks: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "", "blocks"),
 			"blocks",
@@ -130,7 +135,7 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 	today := time.Now()
 	statistics, err := collectByDate(today)
 	if err != nil {
-		log.Error(err)
+		level.Error(c.logger).Log(err)
 		return
 	}
 
diff --git a/main.go b/main.go
index cebfdb7..e01ad7c 100644
--- a/main.go
+++ b/main.go
@@ -59,7 +59,7 @@ func main() {
 
 	level.Info(logger).Log("msg", "Listening on", *listenAddress)
 
-	collector := collector()
+	collector := collector(logger)
 	prometheus.MustRegister(collector)
 	prometheus.Unregister(prometheus.NewGoCollector())
 	registry := prometheus.NewRegistry()