diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..8625bdb
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,3 @@
+PRIVATE_KEY=
+ETHERSCAN_API_KEY=
+MAINNET_ENDPOINT_URL=https://mainnet.infura.io/v3/9b2d9ce8681f477199d092f7e77658c5
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index b3eb773..850310c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ node_modules
 coverage
 coverage.json
 build
+.env
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c29f41e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+
+### First step
+Rename `.env.example` to `.env` and put your parameters there.
\ No newline at end of file
diff --git a/package.json b/package.json
index 86658a9..f986cf3 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "license": "MIT",
     "dependencies": {
         "@openzeppelin/contracts": "^3.3.0",
+        "dotenv": "^10.0.0",
         "eth-gas-reporter": "^0.2.22",
         "truffle-plugin-verify": "^0.5.7"
     },
diff --git a/truffle-config.js b/truffle-config.js
index 2e083d2..841d817 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -1,7 +1,8 @@
 const HDWalletProvider = require('@truffle/hdwallet-provider');
-const privateKey = '';
-const etherscanAPIKey = ''
-const mainnetEndpointUrl = 'https://mainnet.infura.io/v3/9b2d9ce8681f477199d092f7e77658c5';
+require('dotenv').config();
+const privateKey = process.env.PRIVATE_KEY;
+const etherscanAPIKey = process.env.PRIVATE_KEY;
+const mainnetEndpointUrl = process.env.MAINNET_ENDPOINT_URL;
 
 module.exports = {
     networks: {