diff --git a/src/main/java/de/fuberlin/imp/memorybox/restmembox/model/Tone.java b/src/main/java/de/fuberlin/imp/memorybox/restmembox/model/Tone.java
new file mode 100644
index 0000000000000000000000000000000000000000..896c4513d93156b4c3ea491993fa6ee3af982380
--- /dev/null
+++ b/src/main/java/de/fuberlin/imp/memorybox/restmembox/model/Tone.java
@@ -0,0 +1,9 @@
+package de.fuberlin.imp.memorybox.restmembox.model;
+
+/**
+ * Possible tones returned from the Watson API.
+ */
+public enum Tone {
+    FRUSTRATION, IMPOLITENESS, SADNESS, SYMPATHY, POLITENESS,
+    SATISFACTION, EXCITEMENT
+}