diff --git a/cmd.go b/cmd.go
index 40a11df..fa65b34 100644
--- a/cmd.go
+++ b/cmd.go
@@ -61,6 +61,7 @@ type Cmd struct {
 	Name   string
 	Args   []string
 	Env    []string
+	Dir    string
 	Stdout chan string // streaming STDOUT if enabled, else nil (see Options)
 	Stderr chan string // streaming STDERR if enabled, else nil (see Options)
 	*sync.Mutex
@@ -152,6 +153,22 @@ func NewCmdOptions(options Options, name string, args ...string) *Cmd {
 	return out
 }
 
+// SetDir sets the environment variables for the launched command.
+// This can only have effect before starting the command.
+func (c *Cmd) SetDir(dir string) {
+	c.Lock()
+	defer c.Unlock()
+	c.Dir = dir
+}
+
+// SetEnv sets the working directory of the command.
+// This can only have effect before starting the command.
+func (c *Cmd) SetEnv(env []string) {
+	c.Lock()
+	defer c.Unlock()
+	c.Env = env
+}
+
 // Start starts the command and immediately returns a channel that the caller
 // can use to receive the final Status of the command when it ends. The caller
 // can start the command and wait like,
@@ -301,6 +318,10 @@ func (c *Cmd) run() {
 	// Set the runtime environment for the command as per os/exec.Cmd.  If Env
 	// is nil, use the current process' environment.
 	cmd.Env = c.Env
+	// Dir specifies the working directory of the command.
+	// If Dir is the empty string, this runs the command in the
+	// calling process's current directory.
+	cmd.Dir = c.Dir
 
 	// //////////////////////////////////////////////////////////////////////
 	// Start command
diff --git a/cmd_test.go b/cmd_test.go
index 9f1023a..60184d4 100644
--- a/cmd_test.go
+++ b/cmd_test.go
@@ -9,7 +9,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/go-cmd/cmd"
+	"github.com/ShinyTrinkets/go-cmd"
 	"github.com/go-test/deep"
 )