diff --git a/c-struct.cabal b/c-struct.cabal
--- a/c-struct.cabal
+++ b/c-struct.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           c-struct
-version:        0.1.1.3
+version:        0.1.2.0
 synopsis:       To make a wrapper for struct of C language
 description:    Please see the README on GitHub at <https://github.com/YoshikuniJujo/c-struct#readme>
 category:       Foreign
@@ -28,6 +28,7 @@
 library
   exposed-modules:
       Foreign.C.Struct
+      Foreign.C.Struct.TypeSynonyms
   other-modules:
       Foreign.C.Struct.Ord
       Foreign.C.Struct.Parts
diff --git a/src/Foreign/C/Struct/TypeSynonyms.hs b/src/Foreign/C/Struct/TypeSynonyms.hs
new file mode 100644
--- /dev/null
+++ b/src/Foreign/C/Struct/TypeSynonyms.hs
@@ -0,0 +1,5 @@
+module Foreign.C.Struct.TypeSynonyms where
+
+import Foreign.Ptr
+
+type PtrVoid = Ptr ()