diff --git a/docs/Parachain/beginner/section3/chainspec.md b/docs/Parachain/beginner/section3/chainspec.md
new file mode 100644
index 000000000..e4564503b
--- /dev/null
+++ b/docs/Parachain/beginner/section3/chainspec.md
@@ -0,0 +1,15 @@
+---
+id: chainspec
+title: Chain Specification
+sidebar_label: ChainSpec
+description: Customize node settings and genesis config.
+---
+
+In Substrate, a chain specification is the collection of information that describes a
+Substrate-based blockchain network. For example, the chain specification identifies the network that
+a blockchain node connects to, the other nodes that it initially communicates with, and the initial
+state that nodes must agree on to produce blocks.
+
+## What can be changed in a ChainSpec?
+
+## What cannot be changed in a ChainSpec?
diff --git a/sidebars.js b/sidebars.js
index 28110810f..3c179552c 100644
--- a/sidebars.js
+++ b/sidebars.js
@@ -421,6 +421,7 @@ module.exports = {
       link: { type: "doc", id: "Parachain/beginner/section3/index" },
       items: [
         'Parachain/beginner/section3/creating-parathread',
+        'Parachain/beginner/section3/chainspec',
         'Parachain/beginner/section3/sudo-register',
         'Parachain/beginner/section3/developing-parachain',
       ],