diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index 14e96b7..1ea70c6 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -1,4 +1,5 @@
 function Library (ronin) {
+  console.log(ronin)
   this.open = async (path) => {
     return ronin.surface.open(path)
   }
@@ -326,12 +327,15 @@ function Library (ronin) {
     return a === b
   }
 
+  // Client
+  this.ronin = ronin
+
   // Livecoding
   this.time = Date.now
 
+  this.animate = (b = true) => ronin.animate(b)
+
   // javascript interop
   this.js = window
 
-  // Client
-  this.ronin = ronin
 }
diff --git a/documentation.md b/documentation.md
index 13fb4e4..706fee5 100644
--- a/documentation.md
+++ b/documentation.md
@@ -146,6 +146,10 @@
 
 `(time)` returns timestamp in milliseconds
 
+`(animate)` start animation
+
+`(animate false)` stop animation
+
 ## Javascript interop
 
 `js`
diff --git a/examples/animate.lisp b/examples/animate.lisp
index fa12b3c..b43d696 100644
--- a/examples/animate.lisp
+++ b/examples/animate.lisp
@@ -1,13 +1,12 @@
 ; animate
 
 (
-  (def start (get ronin "animate"))
-  
   (def t (sin (div (time) 100)))
 
   (def pos (add 200 (mul 30 t)))
   (defn square (a) (rect a a a a))
   (stroke (square pos) 1 "red")
 
-  (start)
+  (animate)
+  ;(animate false) to stop animation
 )
\ No newline at end of file