diff --git a/README.md b/README.md
index 84f5e10..9eebfd5 100644
--- a/README.md
+++ b/README.md
@@ -4,16 +4,17 @@ Ronin is a graphic design tool under development.
 
 <img src='https://raw.githubusercontent.com/hundredrabbits/Ronin/master/PREVIEW.jpg' width='600'/>
 
-## Themes
+## Electron Build
 
-Drag a .thm file on the window to install it.
-
-## Controls
-
-<img src='https://cdn.rawgit.com/hundredrabbits/Ronin/master/LAYOUT.svg?v=1' width="600"/>
+```
+cd desktop
+npm install
+npm start
+```
 
 ## Extras
 
-- Download additional [themes](https://github.com/hundredrabbits/Themes).
+- This application supports the [Ecosystem Theme](https://github.com/hundredrabbits/Themes).
 - Support this project through [Patreon](https://patreon.com/100).
 - See the [License](LICENSE.md) file for license rights and limitations (MIT).
+- Pull Requests are welcome!
diff --git a/desktop/sources/scripts/lib/theme.js b/desktop/sources/scripts/lib/theme.js
index 8ae7708..2618d9a 100644
--- a/desktop/sources/scripts/lib/theme.js
+++ b/desktop/sources/scripts/lib/theme.js
@@ -60,7 +60,7 @@ function Theme (_default) {
     e.stopPropagation()
     const file = e.dataTransfer.files[0]
     if (!file || !file.name) { console.warn('Theme', 'Unnamed file.'); return }
-    if (file.name.indexOf('.thm') < 0 && file.name.indexOf('.svg') < 0) { console.warn('Theme', 'Skipped, not a theme'); return }
+    if (file.name.indexOf('.thm') < 0 && file.name.indexOf('.svg') < 0) { return }
     const reader = new FileReader()
     reader.onload = function (e) {
       themer.load(e.target.result)
diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index ed98056..0d0c012 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -131,11 +131,6 @@ function Library (ronin) {
     return rect
   }
 
-  this.echo = function (any) {
-    console.log(any)
-    return any
-  }
-
   //
 
   this.of = function (h, k) {
@@ -155,7 +150,7 @@ function Library (ronin) {
   this.mul = function (...args) {
     return args.reduce((sum, val) => sum * val)
   }
-  
+
   this.div = function (...args) {
     return args.reduce((sum, val) => sum / val)
   }
@@ -171,4 +166,20 @@ function Library (ronin) {
   this.step = function (val, step) {
     return Math.round(val / step) * step
   }
+
+  // Generics
+
+  this.echo = function (...args) {
+    console.log(args.reduce((acc, val) => { return acc + val + ' ' }, ''))
+    return args
+  }
+
+  this.test = function (name, a, b) {
+    if (a !== b) {
+      console.warn('failed ' + name, a, b)
+    } else {
+      console.log('passed ' + name, a, b)
+    }
+    return a === b
+  }
 }
diff --git a/desktop/sources/scripts/lisp.js b/desktop/sources/scripts/lisp.js
index 0cb4b73..4f864c7 100644
--- a/desktop/sources/scripts/lisp.js
+++ b/desktop/sources/scripts/lisp.js
@@ -22,7 +22,7 @@ function Lisp (input, lib) {
     run: (input, context) => {
       const file = fs.readFileSync(
         path.resolve(input[1].value),
-        {encoding: "utf-8"})
+        { encoding: 'utf-8' })
 
       return interpret(this.parse(file), context)
     },
diff --git a/examples/benchmark.lisp b/examples/benchmark.lisp
new file mode 100644
index 0000000..7a51145
--- /dev/null
+++ b/examples/benchmark.lisp
@@ -0,0 +1,16 @@
+; benchmark
+
+(
+; Basics
+
+  (test "add" (add 8 4 2) 14)
+  (test "sub" (sub 8 4 2) 2)
+  (test "mul" (mul 8 4 2) 64)
+  (test "div" (div 8 4 2) 1)
+
+; Others
+
+  (test "mod" (mod 6 4) 2)
+  (test "clamp" (clamp 12 4 8) 8)
+  (test "step" (step 12 10) 10)
+)
\ No newline at end of file