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+# Package xz
+
+This Go language package supports the reading and writing of xz
+compressed streams. It includes also a gxz command for compressing and
+decompressing data. The package is completely written in Go and doesn't
+have any dependency on any C code.
+
+The package is currently under development. There might be bugs and APIs
+are not considered stable. At this time the package cannot compete with
+the xz tool regarding compression speed and size. The algorithms there
+have been developed over a long time and are highly optimized. However
+there are a number of improvements planned and I'm very optimistic about
+parallel compression and decompression. Stay tuned!
+
+# Using the API
+
+The following example program shows how to use the API.
+
+    package main
+
+    import (
+        "bytes"
+        "io"
+        "log"
+        "os"
+
+        "github.com/ulikunitz/xz"
+    )
+
+    func main() {
+        const text = "The quick brown fox jumps over the lazy dog.\n"
+        var buf bytes.Buffer
+        // compress text
+        w, err := xz.NewWriter(&buf)
+        if err != nil {
+            log.Fatalf("xz.NewWriter error %s", err)
+        }
+        if _, err := io.WriteString(w, text); err != nil {
+            log.Fatalf("WriteString error %s", err)
+        }
+        if err := w.Close(); err != nil {
+            log.Fatalf("w.Close error %s", err)
+        }
+        // decompress buffer and write output to stdout
+        r, err := xz.NewReader(&buf)
+        if err != nil {
+            log.Fatalf("NewReader error %s", err)
+        }
+        if _, err = io.Copy(os.Stdout, r); err != nil {
+            log.Fatalf("io.Copy error %s", err)
+        }
+    }
+
+# Using the gxz compression tool
+
+The package includes a gxz command line utility for compression and
+decompression.
+
+Use following command for installation:
+
+    $ go get github.com/ulikunitz/xz/cmd/gxz
+
+To test it call the following command.
+
+    $ gxz bigfile
+
+After some time a much smaller file bigfile.xz will replace bigfile.
+To decompress it use the following command.
+
+    $ gxz -d bigfile.xz
+