diff --git a/README.md b/README.md
index e31fcc9..af13efe 100644
--- a/README.md
+++ b/README.md
@@ -22,22 +22,28 @@ Give the target URL and press Enter, then the attack will be launched with defau
 ### Options
 
 #### Rate Limit
-
 The request rate per time unit to issue against the targets.
 Give 0 then it will send requests as fast as possible.
+Default is `50`.
 
 #### Duration
 The amount of time to issue requests to the targets. Give `0s` for an infinite attack. Press `Ctrl-C` to stop.
-Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h". Default is `10s`.
+Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+Default is `10s`.
 
 #### Timeout
 The timeout for each request. `0s` means to disable timeouts.
+Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+Default is `30s`
 
-**Method**
+#### Method
+An HTTP request method for each request.
 
-**Header**
+#### Header
+A request header to be sent.
 
-**Body**
+#### Body
+The file whose content will be set as the http request body.
 
 ## Features
 
diff --git a/attacker/attacker.go b/attacker/attacker.go
index ee4c36c..248de0b 100644
--- a/attacker/attacker.go
+++ b/attacker/attacker.go
@@ -2,6 +2,7 @@ package attacker
 
 import (
 	"context"
+	"io/ioutil"
 	"net/http"
 	"time"
 
@@ -26,7 +27,7 @@ type Options struct {
 	Duration time.Duration
 	Timeout  time.Duration
 	Method   string
-	Body     []byte
+	BodyFile string
 	Header   http.Header
 
 	Attacker Attacker
@@ -52,12 +53,21 @@ func Attack(ctx context.Context, target string, resCh chan *Result, opts Options
 	if opts.Attacker == nil {
 		opts.Attacker = vegeta.NewAttacker(vegeta.Timeout(opts.Timeout))
 	}
+	var body []byte
+	if opts.BodyFile != "" {
+		if b, err := ioutil.ReadFile(opts.BodyFile); err != nil {
+			// TODO: Report to report widget
+			return nil
+		} else {
+			body = b
+		}
+	}
 
 	rate := vegeta.Rate{Freq: opts.Rate, Per: time.Second}
 	targeter := vegeta.NewStaticTargeter(vegeta.Target{
 		Method: opts.Method,
 		URL:    target,
-		Body:   opts.Body,
+		Body:   body,
 		Header: opts.Header,
 	})
 
diff --git a/attacker/metrics.go b/attacker/metrics.go
index a040786..6496792 100644
--- a/attacker/metrics.go
+++ b/attacker/metrics.go
@@ -8,7 +8,6 @@ import (
 )
 
 // Metrics wraps "vegeta.Metrics" to avoid dependency on it.
-// TODO: Add more fields
 type Metrics struct {
 	// Latencies holds computed request latency metrics.
 	Latencies vegeta.LatencyMetrics `json:"latencies"`
diff --git a/gui/keybinds.go b/gui/keybinds.go
index b8f79bb..5e0505a 100644
--- a/gui/keybinds.go
+++ b/gui/keybinds.go
@@ -59,7 +59,6 @@ func makeOptions(w *widgets) (attacker.Options, error) {
 		duration time.Duration
 		timeout  time.Duration
 		method   string
-		body     string
 		header   = make(http.Header)
 		err      error
 	)
@@ -97,8 +96,6 @@ func makeOptions(w *widgets) (attacker.Options, error) {
 		}
 	}
 
-	body = w.bodyInput.Read()
-
 	if s := w.headerInput.Read(); s != "" {
 		parts := strings.SplitN(s, ":", 2)
 		if len(parts) != 2 {
@@ -119,7 +116,7 @@ func makeOptions(w *widgets) (attacker.Options, error) {
 		Duration: duration,
 		Timeout:  timeout,
 		Method:   method,
-		Body:     []byte(body),
+		BodyFile: w.bodyInput.Read(),
 		Header:   header,
 	}, nil
 }