diff --git a/gpu-vulkan.cabal b/gpu-vulkan.cabal
--- a/gpu-vulkan.cabal
+++ b/gpu-vulkan.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           gpu-vulkan
-version:        0.1.0.138
+version:        0.1.0.139
 synopsis:       Vulkan library
 description:    Please see the README on GitHub at <https://github.com/YoshikuniJujo/gpu-vulkan#readme>
 category:       GPU
diff --git a/src/Gpu/Vulkan/Memory.hs b/src/Gpu/Vulkan/Memory.hs
--- a/src/Gpu/Vulkan/Memory.hs
+++ b/src/Gpu/Vulkan/Memory.hs
@@ -22,11 +22,13 @@
 
 	-- ** MEMORY
 
-	M, getBinded, ImageBuffer(..), ImageBufferBinded(..), ImageBufferArg(..),
+	M, getBinded,
+	ImageBuffer(..), ImageBufferBinded(..), ImageBufferArg(..),
 
 	-- ** ALLOCATE INFO
 
 	AllocateInfo(..), M.MType(..), M.TypeBits, M.TypeIndex, M.elemTypeIndex,
+	M.Heap(..),
 
 	-- ** BINDABLE AND REBINDABLE