diff --git a/cmd/lambda/lambda_reduce.go b/cmd/lambda/lambda_reduce.go
index 6370942..fbe9929 100644
--- a/cmd/lambda/lambda_reduce.go
+++ b/cmd/lambda/lambda_reduce.go
@@ -5,7 +5,7 @@ import (
 
 	"github.com/spf13/cobra"
 
-	"git.maximhutz.com/max/lambda/internal/config"
+	"git.maximhutz.com/max/lambda/internal/cli"
 	"git.maximhutz.com/max/lambda/internal/registry"
 )
 
@@ -27,14 +27,14 @@ func LambdaReduce() *cobra.Command {
 			inputPath := args[0]
 
 			// Get input source.
-			var source config.Source
+			var source cli.Source
 			if inputPath == "-" {
-				source = config.StdinSource{}
+				source = cli.StdinSource{}
 			} else {
-				source = config.FileSource{Path: inputPath}
+				source = cli.FileSource{Path: inputPath}
 			}
 
-			destination := config.StdoutDestination{}
+			destination := cli.StdoutDestination{}
 
 			r := GetRegistry()
 
diff --git a/internal/config/destination.go b/internal/cli/destination.go
similarity index 72%
rename from internal/config/destination.go
rename to internal/cli/destination.go
index e9fd236..194dbeb 100644
--- a/internal/config/destination.go
+++ b/internal/cli/destination.go
@@ -1,17 +1,17 @@
-package config
+package cli
 
 import (
 	"fmt"
 	"os"
 )
 
-// A method of writing output to the user.
+// A Destination is method of writing output to the user.
 type Destination interface {
 	// Write data to this destination.
 	Write(data string) error
 }
 
-// A destination writing to stdout.
+// An StdoutDestination writes to stdout.
 type StdoutDestination struct{}
 
 func (d StdoutDestination) Write(data string) error {
@@ -19,7 +19,7 @@ func (d StdoutDestination) Write(data string) error {
 	return nil
 }
 
-// A destination writing to a file.
+// A FileDestination writes to a file.
 type FileDestination struct{ Path string }
 
 func (d FileDestination) Write(data string) error {
diff --git a/internal/config/source.go b/internal/cli/source.go
similarity index 98%
rename from internal/config/source.go
rename to internal/cli/source.go
index 758eaa0..0850258 100644
--- a/internal/config/source.go
+++ b/internal/cli/source.go
@@ -1,4 +1,4 @@
-package config
+package cli
 
 import (
 	"io"