diff --git a/backend.go b/backend.go
index 13e15c1..3165f79 100644
--- a/backend.go
+++ b/backend.go
@@ -4,17 +4,19 @@
 
 package main
 
-type Session interface {
-	Fetch(hash, key []byte) ([]byte, error)
-	InTransaction() bool
-	Store(hash, key, value []byte) (bool, error)
-	AllKeys(hash []byte) (chan []byte, int, error)
-	BeginTransaction() error
-	CommitTransaction() error
-	Close() error
-}
+type (
+	Session interface {
+		Fetch(hash, key []byte) ([]byte, error)
+		InTransaction() bool
+		Store(hash, key, value []byte) (bool, error)
+		AllKeys(hash []byte) (chan []byte, int, error)
+		BeginTransaction() error
+		CommitTransaction() error
+		Close() error
+	}
 
-type Backend interface {
-	NewSession() (Session, error)
-	Shutdown() error
-}
+	Backend interface {
+		NewSession() (Session, error)
+		Shutdown() error
+	}
+)