diff --git a/README.md b/README.md
index 3585627c..10fae61f 100755
--- a/README.md
+++ b/README.md
@@ -4,7 +4,6 @@
 
 Nami is a browser based wallet extension to interact with the Cardano blockchain. It's an open-source project and built by [**Berry Pool**](https://pipool.online).
 
-
 ### Testnet
 
 [Download testnet version](./build.zip)
@@ -213,7 +212,12 @@ The `project_id` for API requests can be created under [blockfrost.io](https://b
 
 **Recommended:** Follow this [approach](https://github.com/lxieyang/chrome-extension-boilerplate-react#secrets) in order to keep the keys seperate from the repository.
 
-The quick solution is to go under `./src/config/provider.js` and replace `secrets.PROJECT_ID_MAINNET` and `secrets.PROJECT_ID_TESTNET` with the project ids from blockfrost.
+```
+# Update secrets file with your own keys
+cp secrets.testing.js secrets.development.js
+```
+
+The quick solution is to go under `./src/config/provider.js` and replace `secrets.PROJECT_ID_MAINNET`, `secrets.PROJECT_ID_TESTNET`, `secrets.PROJECT_ID_PREVIEW` and `secrets.PROJECT_ID_PREPROD` with the project ids from blockfrost.
 
 ##### Requirements
 
@@ -222,12 +226,16 @@ The quick solution is to go under `./src/config/provider.js` and replace `secret
 ##### Start development server
 
 ```
+# Update secrets file with your own keys
+cp secrets.testing.js secrets.development.js
 npm start
 ```
 
 ##### Create production build
 
 ```
+# Update secrets file with your own keys
+cp secrets.testing.js secrets.production.js
 npm run build
 ```
 
diff --git a/secrets.testing.js b/secrets.testing.js
index 52eec056..c27a809e 100644
--- a/secrets.testing.js
+++ b/secrets.testing.js
@@ -1,4 +1,6 @@
 export default {
   PROJECT_ID_MAINNET: 'DUMMY_MAINNET',
   PROJECT_ID_TESTNET: 'DUMMY_TESTNET',
+  PROJECT_ID_PREVIEW: 'DUMMY_PREVIEW',
+  PROJECT_ID_PREPROD: 'DUMMY_PREPROD',
 };
diff --git a/utils/build.js b/utils/build.js
index 12b0d5eb..75bf38ff 100755
--- a/utils/build.js
+++ b/utils/build.js
@@ -10,6 +10,16 @@ delete config.chromeExtensionBoilerplate;
 
 config.mode = 'production';
 
-webpack(config, function (err) {
-  if (err) throw err;
+webpack(config, function (err, stats) {
+  if (stats.hasErrors()) {
+    console.log(
+      stats.toString({
+        colors: true,
+      })
+    );
+  }
+
+  if (err) {
+    throw err;
+  }
 });