diff --git a/.gitignore b/.gitignore
index 60124fa7..98652582 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ target/
 project/target
 project/project/target/
 stuff
+releases
 
 # hidden files
 *.~
@@ -11,6 +12,8 @@ stuff
 # compiled Scala files
 *.jar
 *.class
+*.zip
+*.js
 
 # compiled Millfork files
 *.prg
diff --git a/build.sbt b/build.sbt
index c502bca4..dd64b43b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -32,4 +32,34 @@ lazy val root = (project in file(".")).
   settings(
     buildInfoKeys := Seq[BuildInfoKey](name, version, scalaVersion, sbtVersion),
     buildInfoPackage := "millfork.buildinfo"
-  )
\ No newline at end of file
+  )
+
+import sbtassembly.AssemblyKeys
+
+val releaseDist = TaskKey[File]("release-dist", "Creates a distributable zip file.")
+
+releaseDist := {
+  val jar = AssemblyKeys.assembly.value
+  val base = Keys.baseDirectory.value
+  val target = Keys.target.value
+  val name = Keys.name.value
+  val version = Keys.version.value
+  val distDir = target / (name + "-" + version)
+  val releasesDir = base / "releases"
+  val zipFile = releasesDir / (name + "-" + version + ".zip")
+  IO.delete(zipFile)
+  IO.delete(distDir)
+  IO.createDirectory(releasesDir)
+  IO.createDirectory(distDir)
+  IO.copyFile(jar, distDir / jar.name)
+  def copyDir(name: String): Unit = {
+    IO.createDirectory(distDir / name)
+    IO.copyDirectory(base / name, distDir / name)
+  }
+  copyDir("include")
+  copyDir("doc")
+  def entries(f: File): List[File] = f :: (if (f.isDirectory) IO.listFiles(f).toList.flatMap(entries) else Nil)
+  IO.zip(entries(distDir).map(d => (d, d.getAbsolutePath.substring(distDir.getParent.length + 1))), zipFile)
+  IO.delete(distDir)
+  zipFile
+}