diff --git a/contracts/asset-proxy/src/artifacts.ts b/contracts/asset-proxy/src/artifacts.ts
index 87b80d0758..d82c0537e2 100644
--- a/contracts/asset-proxy/src/artifacts.ts
+++ b/contracts/asset-proxy/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as DummyERC20Token from '../generated-artifacts/DummyERC20Token.json';
diff --git a/contracts/asset-proxy/src/wrappers.ts b/contracts/asset-proxy/src/wrappers.ts
index 4bff2f423f..f8cd342c0b 100644
--- a/contracts/asset-proxy/src/wrappers.ts
+++ b/contracts/asset-proxy/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/dummy_erc20_token';
 export * from '../generated-wrappers/dummy_erc721_receiver';
 export * from '../generated-wrappers/dummy_erc721_token';
diff --git a/contracts/erc20/src/artifacts.ts b/contracts/erc20/src/artifacts.ts
index 0627b98cf2..c97a73195e 100644
--- a/contracts/erc20/src/artifacts.ts
+++ b/contracts/erc20/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as DummyERC20Token from '../generated-artifacts/DummyERC20Token.json';
diff --git a/contracts/erc20/src/wrappers.ts b/contracts/erc20/src/wrappers.ts
index b66c3b1ca2..40193e7d86 100644
--- a/contracts/erc20/src/wrappers.ts
+++ b/contracts/erc20/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/dummy_erc20_token';
 export * from '../generated-wrappers/dummy_multiple_return_erc20_token';
 export * from '../generated-wrappers/dummy_no_return_erc20_token';
diff --git a/contracts/erc721/src/artifacts.ts b/contracts/erc721/src/artifacts.ts
index daa29a83c0..79a76e21b4 100644
--- a/contracts/erc721/src/artifacts.ts
+++ b/contracts/erc721/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as DummyERC721Receiver from '../generated-artifacts/DummyERC721Receiver.json';
diff --git a/contracts/erc721/src/wrappers.ts b/contracts/erc721/src/wrappers.ts
index 909e05868b..716f6cca4e 100644
--- a/contracts/erc721/src/wrappers.ts
+++ b/contracts/erc721/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/dummy_erc721_receiver';
 export * from '../generated-wrappers/dummy_erc721_token';
 export * from '../generated-wrappers/erc721_token';
diff --git a/contracts/exchange-forwarder/src/artifacts.ts b/contracts/exchange-forwarder/src/artifacts.ts
index 39295b7973..94bcdf84a8 100644
--- a/contracts/exchange-forwarder/src/artifacts.ts
+++ b/contracts/exchange-forwarder/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as DummyERC20Token from '../generated-artifacts/DummyERC20Token.json';
diff --git a/contracts/exchange-forwarder/src/wrappers.ts b/contracts/exchange-forwarder/src/wrappers.ts
index a023f878cc..cbe72c5cfc 100644
--- a/contracts/exchange-forwarder/src/wrappers.ts
+++ b/contracts/exchange-forwarder/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/dummy_erc20_token';
 export * from '../generated-wrappers/dummy_erc721_token';
 export * from '../generated-wrappers/exchange';
diff --git a/contracts/exchange-libs/src/artifacts.ts b/contracts/exchange-libs/src/artifacts.ts
index 5e660e1a8a..861d6f3d2d 100644
--- a/contracts/exchange-libs/src/artifacts.ts
+++ b/contracts/exchange-libs/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as LibAbiEncoder from '../generated-artifacts/LibAbiEncoder.json';
diff --git a/contracts/exchange-libs/src/wrappers.ts b/contracts/exchange-libs/src/wrappers.ts
index 8408861817..05244d87b7 100644
--- a/contracts/exchange-libs/src/wrappers.ts
+++ b/contracts/exchange-libs/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/lib_abi_encoder';
 export * from '../generated-wrappers/lib_asset_proxy_errors';
 export * from '../generated-wrappers/lib_constants';
diff --git a/contracts/exchange/src/artifacts.ts b/contracts/exchange/src/artifacts.ts
index e49aea10b4..efdacd376e 100644
--- a/contracts/exchange/src/artifacts.ts
+++ b/contracts/exchange/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as DummyERC20Token from '../generated-artifacts/DummyERC20Token.json';
diff --git a/contracts/exchange/src/wrappers.ts b/contracts/exchange/src/wrappers.ts
index eca3c1c89b..1c1d7fdb44 100644
--- a/contracts/exchange/src/wrappers.ts
+++ b/contracts/exchange/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/dummy_erc20_token';
 export * from '../generated-wrappers/dummy_erc721_token';
 export * from '../generated-wrappers/dummy_no_return_erc20_token';
diff --git a/contracts/extensions/src/artifacts.ts b/contracts/extensions/src/artifacts.ts
index 6db3daecc2..efa5c859c1 100644
--- a/contracts/extensions/src/artifacts.ts
+++ b/contracts/extensions/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as BalanceThresholdFilter from '../generated-artifacts/BalanceThresholdFilter.json';
diff --git a/contracts/extensions/src/wrappers.ts b/contracts/extensions/src/wrappers.ts
index d34cca2926..1a67d2ee39 100644
--- a/contracts/extensions/src/wrappers.ts
+++ b/contracts/extensions/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/balance_threshold_filter';
 export * from '../generated-wrappers/dummy_erc20_token';
 export * from '../generated-wrappers/dummy_erc721_token';
diff --git a/contracts/multisig/src/artifacts.ts b/contracts/multisig/src/artifacts.ts
index 37aa9d4ef2..7d8a85884b 100644
--- a/contracts/multisig/src/artifacts.ts
+++ b/contracts/multisig/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as AssetProxyOwner from '../generated-artifacts/AssetProxyOwner.json';
diff --git a/contracts/multisig/src/wrappers.ts b/contracts/multisig/src/wrappers.ts
index fc46799d0a..81aab39da2 100644
--- a/contracts/multisig/src/wrappers.ts
+++ b/contracts/multisig/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/asset_proxy_owner';
 export * from '../generated-wrappers/mixin_authorizable';
 export * from '../generated-wrappers/multi_sig_wallet';
diff --git a/contracts/utils/src/artifacts.ts b/contracts/utils/src/artifacts.ts
index 26f665eec8..15a1abedfc 100644
--- a/contracts/utils/src/artifacts.ts
+++ b/contracts/utils/src/artifacts.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 import { ContractArtifact } from 'ethereum-types';
 
 import * as IOwnable from '../generated-artifacts/IOwnable.json';
diff --git a/contracts/utils/src/wrappers.ts b/contracts/utils/src/wrappers.ts
index fc8e4584a2..8748cb074d 100644
--- a/contracts/utils/src/wrappers.ts
+++ b/contracts/utils/src/wrappers.ts
@@ -1,4 +1,8 @@
-// This file is auto-generated by contracts-gen. Don't edit manually.
+/*
+ * -----------------------------------------------------------------------------
+ * Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+ * -----------------------------------------------------------------------------
+ */
 export * from '../generated-wrappers/i_ownable';
 export * from '../generated-wrappers/lib_bytes';
 export * from '../generated-wrappers/ownable';
diff --git a/packages/contracts-gen/src/contracts-gen.ts b/packages/contracts-gen/src/contracts-gen.ts
index 0695d9c984..0160a82046 100644
--- a/packages/contracts-gen/src/contracts-gen.ts
+++ b/packages/contracts-gen/src/contracts-gen.ts
@@ -14,7 +14,11 @@ const SOLIDITY_EXTENSION = '.sol';
 const DEFAULT_ARTIFACTS_DIR = 'artifacts';
 const DEFAULT_CONTRACTS_DIR = 'contracts';
 const DEFAULT_WRAPPERS_DIR = 'generated-wrappers';
-const AUTO_GENERATED_BANNER = `This file is auto-generated by contracts-gen. Don't edit manually.`;
+const AUTO_GENERATED_BANNER = `/*
+* -----------------------------------------------------------------------------
+* Warning: This file is auto-generated by contracts-gen. Don't edit manually.
+* -----------------------------------------------------------------------------
+*/`;
 const AUTO_GENERATED_BANNER_FOR_LISTS = `This list is auto-generated by contracts-gen. Don't edit manually.`;
 
 (async () => {
@@ -82,7 +86,7 @@ function generateArtifactsTs(contracts: string[], artifactsDir: string, prettier
         }
     });
     const artifactsTs = `
-    // ${AUTO_GENERATED_BANNER}
+    ${AUTO_GENERATED_BANNER}
     import { ContractArtifact } from 'ethereum-types';
 
     ${sortedImports.join('\n')}
@@ -102,7 +106,7 @@ function generateWrappersTs(contracts: string[], wrappersDir: string, prettierCo
     });
     const sortedImports = _.sortBy(imports);
     const wrappersTs = `
-    // ${AUTO_GENERATED_BANNER}
+    ${AUTO_GENERATED_BANNER}
     ${sortedImports.join('\n')}
     `;
     const WRAPPERS_TS_FILE_PATH = 'src/wrappers.ts';