diff --git a/example/caller.go b/example/caller.go
new file mode 100644
index 0000000..2489345
--- /dev/null
+++ b/example/caller.go
@@ -0,0 +1,16 @@
+package example
+
+import (
+	"context"
+	"fmt"
+	"os"
+)
+
+func Main() {
+	resp, err := getViewer(context.Background())
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Println("you are:", resp.Viewer.Name)
+}
diff --git a/example/cmd/example/main.go b/example/cmd/example/main.go
new file mode 100644
index 0000000..a39abcf
--- /dev/null
+++ b/example/cmd/example/main.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	example "github.com/Khan/genql/example"
+)
+
+func main() {
+	example.Main()
+}
diff --git a/example/generated.go b/example/generated.go
index f985945..58c15ed 100755
--- a/example/generated.go
+++ b/example/generated.go
@@ -3,6 +3,7 @@ package example
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"strings"
@@ -10,19 +11,19 @@ import (
 	"github.com/vektah/gqlparser/gqlerror"
 )
 
-type GetViewerResponse = struct {
+type getViewerResponse = struct {
 	Viewer struct {
 		Name *string
 	}
 }
 
 // TODO
-func GetViewer(ctx context.Context) (*GetViewerResponse, error) {
+func getViewer(ctx context.Context) (*getViewerResponse, error) {
 	req, err := http.NewRequest(
 		http.MethodPost,
 		`https://api.github.com/graphql`,
 		strings.NewReader(`
-query GetViewer {
+query getViewer {
 	Viewer: viewer {
 		Name: name
 	}
@@ -44,8 +45,12 @@ query GetViewer {
 		return nil, err
 	}
 
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("returned error %v: %v", resp.Status, string(body))
+	}
+
 	var retval struct {
-		Data   GetViewerResponse `json:"data"`
+		Data   getViewerResponse `json:"data"`
 		Errors gqlerror.List     `json:"errors"`
 	}
 	err = json.Unmarshal(body, &retval)
diff --git a/example/queries.graphql b/example/queries.graphql
index 10f97d7..484ce24 100644
--- a/example/queries.graphql
+++ b/example/queries.graphql
@@ -1,5 +1,5 @@
-# GetViewer gets the current user's name.
-query GetViewer {
+# getViewer gets the current user's name.
+query getViewer {
   Viewer: viewer {
     Name: name
   }
diff --git a/generate/operation.go.tmpl b/generate/operation.go.tmpl
index 8d7b354..89aff2a 100644
--- a/generate/operation.go.tmpl
+++ b/generate/operation.go.tmpl
@@ -3,6 +3,7 @@ package {{.PackageName}}
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"strings"
@@ -35,6 +36,10 @@ func {{.OperationName}}(ctx context.Context) (*{{.ResponseName}}, error) {
 		return nil, err
 	}
 
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("returned error %v: %v", resp.Status, string(body))
+	}
+
 	var retval struct {
 		Data   {{.ResponseName}} `json:"data"`
 		Errors gqlerror.List     `json:"errors"`