diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..1cb6355
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,8 @@
+node_modules
+bundle*
+*.log
+tmp
+mbtiles
+tiles
+.DS_Store
+docs
diff --git a/README.md b/README.md
index d6f11ba..85e0a20 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ A node.js based [Vector Tile](http://wiki.openstreetmap.org/wiki/Vector_tiles) t
 
 ## How to install
 
-If you haven't already got Node.js >= version 4, then [go get it](http://nodejs.org/).
+If you haven't already got Node.js >= version 4.5, then [go get it](http://nodejs.org/).
 
 ```
 npm install -g mapscii
diff --git a/package.json b/package.json
index a75ccd0..e0d744a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mapscii",
-  "version": "0.1.0",
+  "version": "0.1.2",
   "description": "Terminal Map Viewer",
   "main": "main.js",
   "scripts": {
@@ -14,6 +14,9 @@
   "bin": {
     "mapscii": "./bin/mapscii.sh"
   },
+  "engines" : {
+    "node" : ">=4.5.0"
+  },
   "keywords": [
     "map",
     "console",