diff --git a/desktop/sources/scripts/lisp.js b/desktop/sources/scripts/lisp.js
index 07c1eee..56eec45 100644
--- a/desktop/sources/scripts/lisp.js
+++ b/desktop/sources/scripts/lisp.js
@@ -34,6 +34,10 @@ function Lisp (input, lib) {
 
       return interpret(input[2], letContext)
     },
+    def: function (input, context) {
+      context.scope[input[1].value] = input[2].value
+      return input[2]
+    },
     lambda: function (input, context) {
       return function () {
         const lambdaArguments = arguments
diff --git a/examples/benchmark.lisp b/examples/benchmark.lisp
index 991fd4c..5b6abcc 100644
--- a/examples/benchmark.lisp
+++ b/examples/benchmark.lisp
@@ -14,7 +14,7 @@
   (test "clamp" (clamp 12 4 8) 8)
   (test "step" (step 12 10) 10)
   (test "PI" TWO_PI (mul 2 PI))
-  
+
 ; Logic
 
   (test "lt" (lt 3 4) true)
@@ -37,4 +37,9 @@
   (test "range simple" (range 0 4) (0 1 2 3 4))
   (test "range with step" (range 0 4 2) (0 2 4))
   (test "range with negative step" (range 0 -4 -1) (0 -1 -2 -3 -4))
+
+; Scope
+
+  (def aaa 123)
+  (test "def" aaa 123)
 )
\ No newline at end of file
diff --git a/examples/include.lisp b/examples/include.lisp
new file mode 100644
index 0000000..ae2231f
--- /dev/null
+++ b/examples/include.lisp
@@ -0,0 +1,3 @@
+(
+  (def value 12)
+)
\ No newline at end of file
diff --git a/examples/run.lisp b/examples/run.lisp
new file mode 100644
index 0000000..84dc6ee
--- /dev/null
+++ b/examples/run.lisp
@@ -0,0 +1 @@
+(run "./include.lisp")
\ No newline at end of file