diff --git a/.gitignore b/.gitignore
index 3e82fc7..d6aff20 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/.project
 /.classpath
 /.settings
 /.idea
diff --git a/build.sbt b/build.sbt
index e9ace65..ed152cb 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,14 +1,14 @@
 name := "gui-state-machine-api"
 
-version := "1.0"
+version := "0.1.0"
 
 organization := "retest"
 
 scalaVersion := "2.12.7"
 
 // Dependencies to represent the input of states and actions:
-libraryDependencies += "de.retest" % "retest-model" % "5.0.0"
-libraryDependencies += "org.seleniumhq.selenium" % "selenium-java" % "2.35.0"
+libraryDependencies += "de.retest" % "retest-model" % "5.0.0" withSources() withJavadoc()
+libraryDependencies += "org.seleniumhq.selenium" % "selenium-java" % "2.35.0" withSources() withJavadoc()
 
 // Dependencies to provide a REST service:
 libraryDependencies += "com.github.scopt" % "scopt_2.12" % "3.7.0"
@@ -27,4 +27,14 @@ libraryDependencies += "org.scalamock" %% "scalamock" % "4.1.0" % "test"
 // set the main class for 'sbt run'
 mainClass in (Compile, run) := Some("de.retest.guistatemachine.rest.WebServer")
 // set the main class for packaging the main jar
-mainClass in (Compile, packageBin) := Some("de.retest.guistatemachine.rest.WebServer")
\ No newline at end of file
+mainClass in (Compile, packageBin) := Some("de.retest.guistatemachine.rest.WebServer")
+
+publishTo := {
+  val nexus = "https://my.artifact.repo.net/"
+  if (isSnapshot.value)
+    Some("snapshots" at nexus + "content/repositories/snapshots")
+  else
+    Some("releases"  at nexus + "service/local/staging/deploy/maven2")
+}
+
+credentials += Credentials(Path.userHome / ".sbt" / ".credentials")
\ No newline at end of file
diff --git a/project/sbtrelease.sbt b/project/sbtrelease.sbt
new file mode 100644
index 0000000..1654adf
--- /dev/null
+++ b/project/sbtrelease.sbt
@@ -0,0 +1 @@
+addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.10")
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/api/Action.scala b/src/main/scala/de/retest/guistatemachine/api/Action.scala
index 1b6f7f1..aa77304 100644
--- a/src/main/scala/de/retest/guistatemachine/api/Action.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/Action.scala
@@ -2,9 +2,10 @@ package de.retest.guistatemachine.api
 
 /**
   * Interaction from the user with the GUI.
+  * TODO #6 Use an abstract representation of actions from retest-model instead of Selenium.
   */
 case class Action(a: org.openqa.selenium.interactions.Action) {
 
-  // TODO #5 Convert abstract representation of actions into string.
+  // TODO #6 Convert abstract representation of actions into string.
   override def toString: String = "Selenium Action"
 }
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/api/State.scala b/src/main/scala/de/retest/guistatemachine/api/State.scala
index 87c65db..b82047c 100644
--- a/src/main/scala/de/retest/guistatemachine/api/State.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/State.scala
@@ -2,16 +2,24 @@ package de.retest.guistatemachine.api
 
 /**
   * A state should be identified by its corresponding [[Descriptors]].
-  * It consists of actions which have not been explored yet and transitions which build up the state machine.
+  * It consists of actions which have not been explored yet and transitions to states which build up the state machine.
   */
 trait State {
+
+  /**
+    * @return The descriptors which identify this state.
+    */
   def getDescriptors: Descriptors
 
+  /**
+    * @return All actions which have not already been explored/executed from this state.
+    */
   def getNeverExploredActions: Set[Action]
 
   /**
     * NFA states can lead to different states by consuming the same symbol.
     * Hence, we have a set of states per action.
+    * In the legacy code there was a type called `AmbigueState` but a multimap simplifies the implementation.
     */
   def getTransitions: Map[Action, Set[State]]
 
@@ -39,4 +47,4 @@ trait State {
   override def hashCode(): Int = this.getDescriptors.hashCode()
 
   override def toString: String = s"descriptors=${getDescriptors},neverExploredActions=${getNeverExploredActions},transitions=${getTransitions}"
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineApiImpl.scala b/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineApiImpl.scala
index c440e39..31f5532 100644
--- a/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineApiImpl.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineApiImpl.scala
@@ -6,7 +6,6 @@ import de.retest.guistatemachine.api.GuiStateMachine
 import scala.collection.mutable.HashSet
 
 object GuiStateMachineApiImpl extends GuiStateMachineApi {
-  // TODO #4 Use Persistence instead of a custom set?
   val stateMachines = new HashSet[GuiStateMachine]
 
   override def createStateMachine: GuiStateMachine = {
diff --git a/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala b/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
index 2556093..711c132 100644
--- a/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
@@ -8,6 +8,7 @@ class StateImpl(val descriptors: Descriptors, var neverExploredActions: Set[Acti
 
   /**
     * TODO #4 Currently, there is no MultiMap trait for immutable maps in the Scala standard library.
+    * The legacy code used `AmbigueState` here which was more complicated than just a multi map.
     */
   var transitions = new HashMap[Action, Set[State]]
 
@@ -24,4 +25,4 @@ class StateImpl(val descriptors: Descriptors, var neverExploredActions: Set[Acti
       transitions = transitions + (a -> (transitions(a) + to))
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/de/retest/guistatemachine/persistence/Persistence.scala b/src/main/scala/de/retest/guistatemachine/persistence/Persistence.scala
index c5b4d6e..94ddb7c 100644
--- a/src/main/scala/de/retest/guistatemachine/persistence/Persistence.scala
+++ b/src/main/scala/de/retest/guistatemachine/persistence/Persistence.scala
@@ -12,7 +12,7 @@ class Persistence {
 
   def getStateMachine(id: Id): Option[StateMachine] = if (stateMachines.stateMachines.hasElement(id)) Some(stateMachines.stateMachines.getElement(id)) else None
 
-  // TODO #4 Pass all unexplored actions for the initial state!
+  // TODO #1 Pass all unexplored actions for the initial state!
   def createStateMachine(): Id = stateMachines.stateMachines.addNewElement(StateMachine())
 
   def deleteStateMachine(id: Id): Boolean = stateMachines.stateMachines.removeElement(id)
diff --git a/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala b/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
index 625be27..f53775f 100644
--- a/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
+++ b/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
@@ -48,5 +48,6 @@ object WebServer extends App with RestService {
       bindingFuture
         .flatMap(_.unbind()) // trigger unbinding from the port
         .onComplete(_ => system.terminate()) // and shutdown when done
+    case None => println("Missing config.")
   }
-}
\ No newline at end of file
+}