diff --git a/pkg/interop/crypto/crypto.go b/pkg/interop/crypto/crypto.go
index 02fce7c5a..db842ad67 100644
--- a/pkg/interop/crypto/crypto.go
+++ b/pkg/interop/crypto/crypto.go
@@ -35,8 +35,9 @@ func VerifySignature(msg []byte, sig []byte, pub []byte) bool {
 // given message hash using Secp256k1 elliptic curve. Flag isEven denotes Y's
 // least significant bit in decompression algorithm. The return value is byte
 // array representation of the public key which is either empty (if it's not
-// possible to recover key) or contains 32 bytes in BE for X point (in case of
-// success). This function uses Neo.Cryptography.Secp256k1Recover syscall.
+// possible to recover key) or contains 64 bytes with X and Y coordinates (both
+// 32-byte in BE format). This function uses Neo.Cryptography.Secp256k1Recover
+// syscall.
 func Secp256k1Recover(r []byte, s []byte, messageHash []byte, isEven bool) []byte {
 	return nil
 }
@@ -45,8 +46,9 @@ func Secp256k1Recover(r []byte, s []byte, messageHash []byte, isEven bool) []byt
 // given message hash using Secp256r1 elliptic curve. Flag isEven denotes Y's
 // least significant bit in decompression algorithm.  The return value is byte
 // array representation of the public key which is either empty (if it's not
-// possible to recover key) or contains 32 bytes in BE for X point (in case of
-// success). This function uses Neo.Cryptography.Secp256r1Recover syscall.
+// possible to recover key) or contains 64 bytes with X and Y coordinates (both
+// 32-byte in BE format). This function uses Neo.Cryptography.Secp256r1Recover
+// syscall.
 func Secp256r1Recover(r []byte, s []byte, messageHash []byte, isEven bool) []byte {
 	return nil
 }