diff --git a/bench/store.go b/bench/store.go
index 36a64cded..b838e4bf3 100644
--- a/bench/store.go
+++ b/bench/store.go
@@ -9,20 +9,20 @@ import (
 	"github.com/aws/aws-sdk-go/service/s3"
 )
 
-type Uploader interface {
-	Write(p []byte) (n int, err error)
-}
-
+// NewS3Uploader creates an S3Uploader with a hardcoded region and bucket,
+// and a specified key.
 func NewS3Uploader(key string) *S3Uploader {
 	region := "us-east-1"
+	bucket := "benchmarks-pilosa"
 	return &S3Uploader{
 		region,
-		"benchmarks-pilosa",
+		bucket,
 		s3.New(session.New(&aws.Config{Region: aws.String(region)})),
 		key,
 	}
 }
 
+// S3Uploader is an io.Writer for sending output to AWS S3 storage.
 type S3Uploader struct {
 	region  string
 	bucket  string
@@ -30,10 +30,9 @@ type S3Uploader struct {
 	key     string
 }
 
-// pilosa-sandbox is "us-east-1"
-// benchmarks go to benchmarks-pilosa/run-uuid/??.txt
-// first return value of PutObject contains an ETag (hash) of the uploaded object, returned here but not needed
+// Write writes data to the uploader's bucket/key
 func (u *S3Uploader) Write(data []byte) (int, error) {
+	// first return value of PutObject contains an ETag (hash) of the uploaded object, not needed here
 	fmt.Println(string(data))
 	_, err := u.service.PutObject(&s3.PutObjectInput{
 		Body:   strings.NewReader(string(data)),