diff --git a/README.md b/README.md
index d66ea54..a5756df 100644
--- a/README.md
+++ b/README.md
@@ -89,20 +89,3 @@ $ head -c 100000000 /dev/urandom > /tmp/random; cat /tmp/random | pv | time  sh
 95.4MiB 0:00:00 [1.73GiB/s] [ <=>                                                                                  ]
 sh -c "cat > /dev/null"  0.00s user 0.02s system 32% cpu 0.057 total
 ```
-
-### Performance Goals
-
-Test command
-
-```shell script
-head -c 100000000 /dev/urandom > /tmp/random; cat /tmp/random | pv | time coder sh ammar sh -c "cat > /dev/null"
-```
-
-streams at
-
-```shell script
-95.4MiB 0:00:08 [10.7MiB/s] [                                <=>                                                                                                                                                  ]
-       15.34 real         2.16 user         1.54 sys
-```
-
-The same command over wush stdout (which is high performance) streams at 17MB/s.
diff --git a/client.go b/client.go
index 6a2f235..870fe8d 100644
--- a/client.go
+++ b/client.go
@@ -205,7 +205,7 @@ func (r remoteProcess) listen(ctx context.Context) {
 	select {
 	case exitCode := <-exitCode:
 		if exitCode != 0 {
-			r.done <- ExitError{Code: int(exitCode)}
+			r.done <- ExitError{Code: exitCode}
 			return
 		}
 		r.done <- nil
diff --git a/exec.go b/exec.go
index 432e7fa..e515289 100644
--- a/exec.go
+++ b/exec.go
@@ -19,10 +19,10 @@ func (e ExitError) Error() string {
 
 // Process represents a started command.
 type Process interface {
-	// Pid is populated immediately during a successfull start with the process ID.
+	// Pid is populated immediately during a successful start with the process ID.
 	Pid() int
 	// Stdout returns an io.WriteCloser that will pipe writes to the remote command.
-	// Closure of stdin sends the correspoding close messsage.
+	// Closure of stdin sends the corresponding close message.
 	Stdin() io.WriteCloser
 	// Stdout returns an io.Reader that is connected to the command's standard output.
 	Stdout() io.Reader
diff --git a/internal/proto/README.md b/internal/proto/README.md
index ba85205..42cc39b 100644
--- a/internal/proto/README.md
+++ b/internal/proto/README.md
@@ -1,6 +1,6 @@
 # Protocol
 
-Each Message is represented as a single WebSocket message. A newline character separates a JSON header from the binary body.
+Each message is represented as a single WebSocket message. A newline character separates a JSON header from the binary body.
 
 Some messages may omit the body.
 
diff --git a/internal/proto/protocol_test.go b/internal/proto/protocol_test.go
index ab20491..b156928 100644
--- a/internal/proto/protocol_test.go
+++ b/internal/proto/protocol_test.go
@@ -31,7 +31,8 @@ func TestWithHeader(t *testing.T) {
 	for _, tcase := range tests {
 		b := bytes.NewBuffer(nil)
 		withheader := WithHeader(b, []byte(tcase.inputheader))
-		withheader.Write([]byte(tcase.inputbody))
+		_, err := withheader.Write([]byte(tcase.inputbody))
+		assert.Success(t, "write to buffer with header", err)
 
 		msg, err := ioutil.ReadAll(b)
 		assert.Success(t, "read buffer", err)
diff --git a/server.go b/server.go
index a1dc5cd..05a9518 100644
--- a/server.go
+++ b/server.go
@@ -122,7 +122,7 @@ func Serve(ctx context.Context, c *websocket.Conn, execer Execer) error {
 	}
 }
 
-func sendExitCode(ctx context.Context, exitCode int, conn net.Conn) error {
+func sendExitCode(_ context.Context, exitCode int, conn net.Conn) error {
 	header, err := json.Marshal(proto.ServerExitCodeHeader{
 		Type:     proto.TypeExitCode,
 		ExitCode: exitCode,
@@ -134,7 +134,7 @@ func sendExitCode(ctx context.Context, exitCode int, conn net.Conn) error {
 	return err
 }
 
-func sendPID(ctx context.Context, pid int, conn net.Conn) error {
+func sendPID(_ context.Context, pid int, conn net.Conn) error {
 	header, err := json.Marshal(proto.ServerPidHeader{Type: proto.TypePid, Pid: pid})
 	if err != nil {
 		return err