diff --git a/dir.go b/dir.go
index 62c8c33..7e5f2ed 100644
--- a/dir.go
+++ b/dir.go
@@ -139,6 +139,11 @@ func (d *Dir) manipulate(cfg *Config) error {
 	return nil
 }
 
+// Format represents an output format.
+type Format interface {
+	Format(*Page) (path string, content []byte)
+}
+
 // write writes the Dir to the provided destination path.
 func (d *Dir) write(dstDir string, format Format) error {
 	// Create the directory
diff --git a/format.go b/format.go
deleted file mode 100644
index f2dab49..0000000
--- a/format.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package main
-
-// Format represents an output format.
-type Format interface {
-	Format(*Page) (path string, content []byte)
-}
-
-type FormatFunc func(*Page) (string, []byte)
-
-func (f FormatFunc) Format(p *Page) (string, []byte) {
-	return f(p)
-}