diff --git a/frontend/http/frontend.go b/frontend/http/frontend.go
index 86f7610..ebda2e8 100644
--- a/frontend/http/frontend.go
+++ b/frontend/http/frontend.go
@@ -31,19 +31,28 @@ var promResponseDurationMilliseconds = prometheus.NewHistogramVec(
 		Help:    "The duration of time it takes to receive and write a response to an API request",
 		Buckets: prometheus.ExponentialBuckets(9.375, 2, 10),
 	},
-	[]string{"action", "error"},
+	[]string{"action", "address_family", "error"},
 )
 
 // recordResponseDuration records the duration of time to respond to a Request
 // in milliseconds .
-func recordResponseDuration(action string, err error, duration time.Duration) {
+func recordResponseDuration(action string, af *bittorrent.AddressFamily, err error, duration time.Duration) {
 	var errString string
 	if err != nil {
 		errString = err.Error()
 	}
 
+	var afString string
+	if af == nil {
+		afString = "Unknown"
+	} else if *af == bittorrent.IPv4 {
+		afString = "IPv4"
+	} else if *af == bittorrent.IPv6 {
+		afString = "IPv6"
+	}
+
 	promResponseDurationMilliseconds.
-		WithLabelValues(action, errString).
+		WithLabelValues(action, afString, errString).
 		Observe(float64(duration.Nanoseconds()) / float64(time.Millisecond))
 }
 
@@ -149,13 +158,15 @@ func (t *Frontend) ListenAndServe() error {
 func (t *Frontend) announceRoute(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
 	var err error
 	start := time.Now()
-	defer func() { recordResponseDuration("announce", err, time.Since(start)) }()
+	var af *bittorrent.AddressFamily
+	defer func() { recordResponseDuration("announce", af, err, time.Since(start)) }()
 
 	req, err := ParseAnnounce(r, t.RealIPHeader, t.AllowIPSpoofing)
 	if err != nil {
 		WriteError(w, err)
 		return
 	}
+	*af = req.IP.AddressFamily
 
 	resp, err := t.logic.HandleAnnounce(context.Background(), req)
 	if err != nil {
@@ -176,7 +187,8 @@ func (t *Frontend) announceRoute(w http.ResponseWriter, r *http.Request, _ httpr
 func (t *Frontend) scrapeRoute(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
 	var err error
 	start := time.Now()
-	defer func() { recordResponseDuration("scrape", err, time.Since(start)) }()
+	var af *bittorrent.AddressFamily
+	defer func() { recordResponseDuration("scrape", af, err, time.Since(start)) }()
 
 	req, err := ParseScrape(r)
 	if err != nil {
@@ -201,6 +213,7 @@ func (t *Frontend) scrapeRoute(w http.ResponseWriter, r *http.Request, _ httprou
 		WriteError(w, ErrInvalidIP)
 		return
 	}
+	*af = req.AddressFamily
 
 	resp, err := t.logic.HandleScrape(context.Background(), req)
 	if err != nil {
diff --git a/frontend/udp/frontend.go b/frontend/udp/frontend.go
index 910b3a9..fdc0919 100644
--- a/frontend/udp/frontend.go
+++ b/frontend/udp/frontend.go
@@ -34,19 +34,28 @@ var promResponseDurationMilliseconds = prometheus.NewHistogramVec(
 		Help:    "The duration of time it takes to receive and write a response to an API request",
 		Buckets: prometheus.ExponentialBuckets(9.375, 2, 10),
 	},
-	[]string{"action", "error"},
+	[]string{"action", "address_family", "error"},
 )
 
 // recordResponseDuration records the duration of time to respond to a UDP
 // Request in milliseconds .
-func recordResponseDuration(action string, err error, duration time.Duration) {
+func recordResponseDuration(action string, af *bittorrent.AddressFamily, err error, duration time.Duration) {
 	var errString string
 	if err != nil {
 		errString = err.Error()
 	}
 
+	var afString string
+	if af == nil {
+		afString = "Unknown"
+	} else if *af == bittorrent.IPv4 {
+		afString = "IPv4"
+	} else if *af == bittorrent.IPv6 {
+		afString = "IPv6"
+	}
+
 	promResponseDurationMilliseconds.
-		WithLabelValues(action, errString).
+		WithLabelValues(action, afString, errString).
 		Observe(float64(duration.Nanoseconds()) / float64(time.Millisecond))
 }
 
@@ -151,12 +160,12 @@ func (t *Frontend) ListenAndServe() error {
 
 			// Handle the request.
 			start := time.Now()
-			action, err := t.handleRequest(
+			action, af, err := t.handleRequest(
 				// Make sure the IP is copied, not referenced.
 				Request{buffer[:n], append([]byte{}, addr.IP...)},
 				ResponseWriter{t.socket, addr},
 			)
-			recordResponseDuration(action, err, time.Since(start))
+			recordResponseDuration(action, af, err, time.Since(start))
 		}()
 	}
 }
@@ -181,7 +190,7 @@ func (w ResponseWriter) Write(b []byte) (int, error) {
 }
 
 // handleRequest parses and responds to a UDP Request.
-func (t *Frontend) handleRequest(r Request, w ResponseWriter) (actionName string, err error) {
+func (t *Frontend) handleRequest(r Request, w ResponseWriter) (actionName string, af *bittorrent.AddressFamily, err error) {
 	if len(r.Packet) < 16 {
 		// Malformed, no client packets are less than 16 bytes.
 		// We explicitly return nothing in case this is a DoS attempt.
@@ -223,6 +232,7 @@ func (t *Frontend) handleRequest(r Request, w ResponseWriter) (actionName string
 			WriteError(w, txID, err)
 			return
 		}
+		*af = req.IP.AddressFamily
 
 		var resp *bittorrent.AnnounceResponse
 		resp, err = t.logic.HandleAnnounce(context.Background(), req)
@@ -254,6 +264,7 @@ func (t *Frontend) handleRequest(r Request, w ResponseWriter) (actionName string
 			WriteError(w, txID, ErrInvalidIP)
 			return
 		}
+		*af = req.AddressFamily
 
 		var resp *bittorrent.ScrapeResponse
 		resp, err = t.logic.HandleScrape(context.Background(), req)
diff --git a/storage/memory/peer_store.go b/storage/memory/peer_store.go
index 486adc1..d5b7482 100644
--- a/storage/memory/peer_store.go
+++ b/storage/memory/peer_store.go
@@ -28,7 +28,7 @@ var promGCDurationMilliseconds = prometheus.NewHistogram(prometheus.HistogramOpt
 
 var promInfohashesCount = prometheus.NewGauge(prometheus.GaugeOpts{
 	Name: "chihaya_storage_infohashes_count",
-	Help: "The number of Infohashes tracked",
+	Help: "The number of infohashes tracked",
 })
 
 // recordGCDuration records the duration of a GC sweep.