diff --git a/index.js b/index.js
index eb0ce77..8f8743a 100644
--- a/index.js
+++ b/index.js
@@ -4,5 +4,6 @@ module.exports = {
 	registerDynamic: modelCollection.registerDynamic,
 	KalmanFilter: require('./lib/kalman-filter'),
 	registerObservation: modelCollection.registerObservation,
-	getCovariance: require('./lib/utils/get-covariance')
+	getCovariance: require('./lib/utils/get-covariance'),
+	State: require('./lib/state')
 };
diff --git a/package.json b/package.json
index 34b5b74..eac6a9d 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,9 @@
     "url": "git+https://github.com/piercus/kalman-filter.git"
   },
   "release": {
-    "branches": ["master"]
+    "branches": [
+      "master"
+    ]
   },
   "keywords": [
     "kalman",