diff --git a/.gitignore b/.gitignore
index c49b07f..c8451ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ sdiff-test-*
 *.o
 *.obj
 *.lst
+*.a
diff --git a/README.md b/README.md
index 7644d85..fd749da 100644
--- a/README.md
+++ b/README.md
@@ -14,20 +14,13 @@ Add to `dub.json`:
 
 ```json
 {
-	"dependencies": {
-		"sdiff": "~>0.1.0"
-	}
-}
-```
-
-Or
-
-```json
-{
+	"libs": [
+		"xdiff"
+	],
 	"dependencies": {
 		"sdiff": {
 			"repository": "git+https://git.zhirov.kz/dlang/sdiff.git",
-			"version": "<hash from git>"
+			"version": "~0.1.0"
 		}
 	}
 }
diff --git a/source/sdiff/init.d b/source/sdiff/init.d
index 0ab1389..ec657f2 100644
--- a/source/sdiff/init.d
+++ b/source/sdiff/init.d
@@ -31,19 +31,22 @@ shared static this()
 	enforce(rc == 0, "xdl_set_allocator failed (rc=" ~ rc.to!string ~ ")");
 }
 
-mmfile_t initMmfile(size_t blockSize)
-{
-	mmfile_t mf;
-	auto rc = xdl_init_mmfile(&mf, blockSize.to!long, XDL_MMF_ATOMIC);
-	enforce(rc == 0, "xdl_init_mmfile failed (rc=" ~ rc.to!string ~ ")");
-	return mf;
-}
-
 abstract class MM
 {
+private:
+	mmfile_t initMmfile(size_t blockSize)
+	{
+		mmfile_t mf;
+		auto rc = xdl_init_mmfile(&mf, blockSize.to!long, XDL_MMF_ATOMIC);
+		enforce(rc == 0, "xdl_init_mmfile failed (rc=" ~ rc.to!string ~ ")");
+		return mf;
+	}
 protected:
 	mmfile_t _inner;
 public:
+	this(long bsize = 0) {
+		_inner = initMmfile(bsize);
+	}
 	final @property size_t size()
 	{
 		return xdl_mmfile_size(&_inner).to!size_t;
diff --git a/source/sdiff/mmblocks.d b/source/sdiff/mmblocks.d
index 1d25433..8366e81 100644
--- a/source/sdiff/mmblocks.d
+++ b/source/sdiff/mmblocks.d
@@ -14,7 +14,7 @@ final class MMBlocks : MM
 public:
 	this()
 	{
-		_inner = initMmfile(DEFAULT_BSIZE);
+		super(DEFAULT_BSIZE);
 	}
 
 	~this()
diff --git a/source/sdiff/mmfile.d b/source/sdiff/mmfile.d
index a1e91a0..49f1486 100644
--- a/source/sdiff/mmfile.d
+++ b/source/sdiff/mmfile.d
@@ -14,8 +14,6 @@ final class MMFile : MM
 private:
 	void _write(const(ubyte)[] data)
 	{
-		_inner = initMmfile(0);
-
 		if (data.length > 0)
 		{
 			auto length = data.length.to!long;