diff --git a/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef b/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef
new file mode 100644
index 0000000..0070c1c
--- /dev/null
+++ b/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef
@@ -0,0 +1,11 @@
+{
+    "name": "UniBT.Editor",
+    "references": [
+        "UniBT"
+    ],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": []
+}
diff --git a/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef.meta b/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef.meta
new file mode 100644
index 0000000..795de7e
--- /dev/null
+++ b/Assets/UniBT/Scripts/Editor/UniBT.Editor.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 3dad40524f69b4faab0f11e825b1b08e
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniBT/Scripts/Runtime/UniBT.asmdef b/Assets/UniBT/Scripts/Runtime/UniBT.asmdef
new file mode 100644
index 0000000..68b1d40
--- /dev/null
+++ b/Assets/UniBT/Scripts/Runtime/UniBT.asmdef
@@ -0,0 +1,12 @@
+{
+    "name": "UniBT",
+    "references": [],
+    "optionalUnityReferences": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": []
+}
diff --git a/Assets/UniBT/Scripts/Runtime/UniBT.asmdef.meta b/Assets/UniBT/Scripts/Runtime/UniBT.asmdef.meta
new file mode 100644
index 0000000..a59fea6
--- /dev/null
+++ b/Assets/UniBT/Scripts/Runtime/UniBT.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 4a9214fa9d60c4c92bfc3c635010f27f
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniBT/Scripts/package.json b/Assets/UniBT/Scripts/package.json
new file mode 100644
index 0000000..67d4de9
--- /dev/null
+++ b/Assets/UniBT/Scripts/package.json
@@ -0,0 +1,8 @@
+{
+    "name": "com.github.yoshidan.unibt",
+    "displayName": "UniBT",
+    "version": "1.0.0",
+    "unity": "2019.1",
+    "description": "Behavior tree designer.",
+    "dependencies": {}
+}
diff --git a/Assets/UniBT/Scripts/package.json.meta b/Assets/UniBT/Scripts/package.json.meta
new file mode 100644
index 0000000..450967a
--- /dev/null
+++ b/Assets/UniBT/Scripts/package.json.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: d6a26b80ccf304beab041e171c8b53da
+PackageManifestImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/README.md b/README.md
index 05ba468..8da93e1 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,18 @@ I will provide easily customizable and free designer.
 
 ## Get Started
 
-1. [Download](https://github.com/yoshidan/UniBT/releases) and install unity package.
+1. [Download](https://github.com/yoshidan/UniBT/releases) and install unity package.   
+  Also the package can also be imported with Package Manager, by adding the following entry in your `Packages/manifest.json`:
+```json
+{
+  "dependencies": {
+    ...
+    "com.github.yoshidan.unibt": "https://github.com/yoshidan/UniBT.git?path=Assets/UniBT/Scripts"
+  }
+}
+```
+
+
 2. Add `UniBT.BehaviorTree` component for any GameObject.  
    <img src="images/started1.jpg" width="240"/>
 3. `Open Graph Editor` button opens GraphView for Behavior Tree.