diff --git a/package.json b/package.json
index 0f7388db..88ef82c9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jssm",
-  "version": "0.6.0",
+  "version": "0.6.1",
   "description": "A Javascript state machine with a simple API. Well tested, and typed with Flowtype. MIT License.",
   "main": "dist/jssm.es5.browserified.js",
   "scripts": {
diff --git a/src/js/jssm-types.js b/src/js/jssm-types.js
index be6f70e3..8dce3283 100644
--- a/src/js/jssm-types.js
+++ b/src/js/jssm-types.js
@@ -43,7 +43,9 @@ type JssmGenericMachine<NT, DT> = {
 
   allow_empty?     : boolean,
   allow_islands?   : boolean,
-  allow_force?     : boolean
+  allow_force?     : boolean,
+
+  keep_history?    : boolean | number
 
 };
 
diff --git a/src/js/jssm.js b/src/js/jssm.js
index 56f1b7b9..17e07996 100644
--- a/src/js/jssm.js
+++ b/src/js/jssm.js
@@ -17,7 +17,7 @@ const new_machine = (props:mixed) : JssmMachine => {
 
 
 
-class jssm {
+class machine {
 
 
   constructor({ transitions } : JssmConfig) {
@@ -134,6 +134,8 @@ class jssm {
 
 export {
 
+  machine,
+
   new_machine,
   version