diff --git a/Cargo.lock b/Cargo.lock
index a460f03e..d328cd89 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -393,6 +393,7 @@ dependencies = [
  "ethers-providers",
  "futures-util",
  "serde",
+ "serde_json",
  "thiserror",
  "tokio",
 ]
diff --git a/ethers-contract/ethers-contract-abigen/README.md b/ethers-contract/ethers-contract-abigen/README.md
new file mode 100644
index 00000000..32456f83
--- /dev/null
+++ b/ethers-contract/ethers-contract-abigen/README.md
@@ -0,0 +1 @@
+This code generator was adapted from the original [ethcontract-rs repository by Gnosis](https://github.com/gnosis/ethcontract-rs/tree/master/generate).
diff --git a/ethers-contract/ethers-contract-derive/README.md b/ethers-contract/ethers-contract-derive/README.md
new file mode 100644
index 00000000..9ca54ec8
--- /dev/null
+++ b/ethers-contract/ethers-contract-derive/README.md
@@ -0,0 +1 @@
+This proc-macro was adapted from the original [ethcontract-rs repository by Gnosis](https://github.com/gnosis/ethcontract-rs/tree/master/derive).