diff --git a/Source/Shared/Storage/AsyncStorage.swift b/Source/Shared/Storage/AsyncStorage.swift
index f2ca945..2c572e4 100644
--- a/Source/Shared/Storage/AsyncStorage.swift
+++ b/Source/Shared/Storage/AsyncStorage.swift
@@ -4,10 +4,10 @@ import Dispatch
 /// Manipulate storage in a "all async" manner.
 /// The completion closure will be called when operation completes.
 public class AsyncStorage<T> {
-  fileprivate let innerStorage: HybridStorage<T>
+  public let innerStorage: HybridStorage<T>
   public let serialQueue: DispatchQueue
 
-  init(storage: HybridStorage<T>, serialQueue: DispatchQueue) {
+  public init(storage: HybridStorage<T>, serialQueue: DispatchQueue) {
     self.innerStorage = storage
     self.serialQueue = serialQueue
   }
diff --git a/Source/Shared/Storage/HybridStorage.swift b/Source/Shared/Storage/HybridStorage.swift
index 240961c..e52d807 100644
--- a/Source/Shared/Storage/HybridStorage.swift
+++ b/Source/Shared/Storage/HybridStorage.swift
@@ -2,10 +2,10 @@ import Foundation
 
 /// Use both memory and disk storage. Try on memory first.
 public class HybridStorage<T> {
-  let memoryStorage: MemoryStorage<T>
-  let diskStorage: DiskStorage<T>
+  public let memoryStorage: MemoryStorage<T>
+  public let diskStorage: DiskStorage<T>
 
-  init(memoryStorage: MemoryStorage<T>, diskStorage: DiskStorage<T>) {
+  public init(memoryStorage: MemoryStorage<T>, diskStorage: DiskStorage<T>) {
     self.memoryStorage = memoryStorage
     self.diskStorage = diskStorage
   }
diff --git a/Source/Shared/Storage/SyncStorage.swift b/Source/Shared/Storage/SyncStorage.swift
index f5d93ce..36f2aad 100644
--- a/Source/Shared/Storage/SyncStorage.swift
+++ b/Source/Shared/Storage/SyncStorage.swift
@@ -4,10 +4,10 @@ import Dispatch
 /// Manipulate storage in a "all sync" manner.
 /// Block the current queue until the operation completes.
 public class SyncStorage<T> {
-  fileprivate let innerStorage: HybridStorage<T>
-  fileprivate let serialQueue: DispatchQueue
+  public let innerStorage: HybridStorage<T>
+  public let serialQueue: DispatchQueue
 
-  init(innerStorage: HybridStorage<T>, serialQueue: DispatchQueue) {
+  public init(innerStorage: HybridStorage<T>, serialQueue: DispatchQueue) {
     self.innerStorage = innerStorage
     self.serialQueue = serialQueue
   }