diff --git a/README.md b/README.md
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+# Javascript Challenges
+This book will challenge you to get and understand the most obscure and tricky parts of Javascript.
+I hope you enjoy this book.
diff --git a/SUMMARY.md b/SUMMARY.md
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+# Summary
+
+* [Autoexecute function](autoexecute/README.md)
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+# Javascript Self Invoking Functions
+
+Try this in your console
+```
+function test() { alert('test'); }();
+```
+What happens? Why?
+
+---
+
+Write the code to execute this function adding only one more character to the sentence.
+
+```js
+
+function test() { alert('test'); }();
+
+```
+
+```js
+
+!function test() { alert('test'); }();
+
+```
+
+```js
+assert(true);
+```
+
+---
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+{
+    "name": "Javascript_Challenges",
+    "version": "0.0.1",
+    "description": "A bunch of Javascript Challenges",
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/tcorral/Javascript-Challenges-book.git"
+    },
+    "author": "Tomás Corral <amischol@gmail.com>",
+    "license": "Apache 2",
+    "dependencies": {},
+    "devDependencies": {
+        "grunt": "~0.4.1",
+        "grunt-gitbook": "0.1.2",
+        "grunt-gh-pages": "0.9.1",
+        "grunt-contrib-clean": "~0.5.0"
+    },
+    "peerDependencies": {
+        "grunt": "~0.4.1"
+    }
+}
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