diff --git a/examples/go.mod b/examples/go.mod
new file mode 100644
index 0000000..747af16
--- /dev/null
+++ b/examples/go.mod
@@ -0,0 +1,10 @@
+module examples
+
+go 1.13
+
+require (
+	github.com/charmbracelet/tea v0.0.0-20200120035228-5156905c3e10
+	github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9
+	github.com/fogleman/ease v0.0.0-20170301025033-8da417bf1776
+	golang.org/x/sys v0.0.0-20200120151820-655fe14d7479 // indirect
+)
diff --git a/examples/go.sum b/examples/go.sum
new file mode 100644
index 0000000..9e103a2
--- /dev/null
+++ b/examples/go.sum
@@ -0,0 +1,11 @@
+github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94/go.mod h1:lijy1lXOKNwMjBu/jTT/DvR8yE9PhtX2olGFsCz9/Vk=
+github.com/charmbracelet/tea v0.0.0-20200120035228-5156905c3e10 h1:C8gRihuPFEUON+BsEe4SsKDfHhgZlStosn9YvE+mtjU=
+github.com/charmbracelet/tea v0.0.0-20200120035228-5156905c3e10/go.mod h1:lijy1lXOKNwMjBu/jTT/DvR8yE9PhtX2olGFsCz9/Vk=
+github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9 h1:YQvJgppGVexnzIJ+KJlK9lBYA3+zXfdqZO/5Ngedtb0=
+github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9/go.mod h1:z8JWtuxM0oA+dZfi7BkgBW2YGbyOTbWAixFs46W3SK4=
+github.com/fogleman/ease v0.0.0-20170301025033-8da417bf1776 h1:VRIbnDWRmAh5yBdz+J6yFMF5vso1It6vn+WmM/5l7MA=
+github.com/fogleman/ease v0.0.0-20170301025033-8da417bf1776/go.mod h1:9wvnDu3YOfxzWM9Cst40msBF1C2UdQgDv962oTxSuMs=
+github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942 h1:A7GG7zcGjl3jqAqGPmcNjd/D9hzL95SuoOQAaFNdLU0=
+github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942/go.mod h1:eCbImbZ95eXtAUIbLAuAVnBnwf83mjf6QIVH8SHYwqQ=
+golang.org/x/sys v0.0.0-20200120151820-655fe14d7479 h1:LhLiKguPgZL+Tglay4GhVtfF0kb8cvOJ0dHTCBO8YNI=
+golang.org/x/sys v0.0.0-20200120151820-655fe14d7479/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/examples/http/main.go b/examples/http/main.go
index 3351cf3..067e25a 100644
--- a/examples/http/main.go
+++ b/examples/http/main.go
@@ -73,7 +73,7 @@ func view(model tea.Model) string {
 	return fmt.Sprintf("The server said: %d %s", m.Status, http.StatusText(m.Status))
 }
 
-func checkServer() tea.Msg {
+func checkServer(_ tea.Model) tea.Msg {
 	c := &http.Client{
 		Timeout: 10 * time.Second,
 	}
diff --git a/go.mod b/go.mod
index a467eb6..d192701 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,7 @@ module github.com/charmbracelet/tea
 
 go 1.13
 
-require github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942
+require (
+	github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942
+	golang.org/x/sys v0.0.0-20200120151820-655fe14d7479 // indirect
+)
diff --git a/go.sum b/go.sum
index ba844f5..5d1a519 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,4 @@
 github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942 h1:A7GG7zcGjl3jqAqGPmcNjd/D9hzL95SuoOQAaFNdLU0=
 github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942/go.mod h1:eCbImbZ95eXtAUIbLAuAVnBnwf83mjf6QIVH8SHYwqQ=
+golang.org/x/sys v0.0.0-20200120151820-655fe14d7479 h1:LhLiKguPgZL+Tglay4GhVtfF0kb8cvOJ0dHTCBO8YNI=
+golang.org/x/sys v0.0.0-20200120151820-655fe14d7479/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/tea.go b/tea.go
index 1741880..aa824d3 100644
--- a/tea.go
+++ b/tea.go
@@ -17,7 +17,7 @@ type Msg interface{}
 type Model interface{}
 
 // Cmd is an IO operation. If it's nil it's considered a no-op.
-type Cmd func() Msg
+type Cmd func(Model) Msg
 
 // Sub is an event subscription. If it returns nil it's considered a no-op.
 type Sub func(Model) Msg
@@ -60,7 +60,7 @@ func NewErrMsg(s string) ErrMsg {
 }
 
 // Quit is a command that tells the program to exit
-func Quit() Msg {
+func Quit(_ Model) Msg {
 	return quitMsg{}
 }
 
@@ -121,7 +121,7 @@ func (p *Program) Start() error {
 		}
 	}()
 
-	// Initialize subscriptions
+	// Process subscriptions
 	go func() {
 		if len(p.subscriptions) > 0 {
 			for _, sub := range p.subscriptions {
@@ -143,7 +143,7 @@ func (p *Program) Start() error {
 			case cmd := <-cmds:
 				if cmd != nil {
 					go func() {
-						msgs <- cmd()
+						msgs <- cmd(model)
 					}()
 				}
 			}