diff --git a/examples/don/evm_keyring.go b/examples/don/evm_keyring.go
index ae89164..f6b882f 100644
--- a/examples/don/evm_keyring.go
+++ b/examples/don/evm_keyring.go
@@ -12,6 +12,8 @@ import (
 	"github.com/ethereum/go-ethereum/crypto/secp256k1"
 )
 
+// NOTE: was copied from github.com/smartcontractkit/libocr
+
 var curve = secp256k1.S256()
 
 func RawReportContext(repctx ReportContext) [3][32]byte {
diff --git a/examples/don/types.go b/examples/don/types.go
index 2363d2f..14f699c 100644
--- a/examples/don/types.go
+++ b/examples/don/types.go
@@ -5,6 +5,8 @@ import (
 	"fmt"
 )
 
+// NOTE: was copied from github.com/smartcontractkit/libocr
+
 // OracleID is an index over the oracles, used as a succinct attribution to an
 // oracle in communication with the on-chain contract. It is not a cryptographic
 // commitment to the oracle's private key, like a public key is.