From 87c969827f30b47ed2bab31f41737db527086ef0 Mon Sep 17 00:00:00 2001
From: Call Delegation <106365423+calldelegation@users.noreply.github.com>
Date: Thu, 12 Dec 2024 09:58:17 -0500
Subject: [PATCH] chainid information

---
 docs/overview.mdx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/overview.mdx b/docs/overview.mdx
index e5bdcb3..8834a6c 100644
--- a/docs/overview.mdx
+++ b/docs/overview.mdx
@@ -27,3 +27,11 @@ These are the RPC endpoints you can use in your applications to interact with th
 **Mainnet**: https://mainnet.fuel.network/v1/graphql
 
 > Note that this is the same endpoint used in the playground above.
+
+## Chain Id
+
+A chain ID is a unique identifier assigned to a blockchain network, whether a testnet or a mainnet (Fuel Ignition), to ensure correct transaction signing and prevent replay attacks across chains.
+
+**Testnet**: [`0`](https://github.com/FuelLabs/chain-configuration/blob/master/ignition-test/chain_config.json#L41)
+
+**Mainnet**: [`9889`](https://github.com/FuelLabs/chain-configuration/blob/master/ignition/chain_config.json#L41)