diff --git a/covertest/run.go b/covertest/run.go
index 173f13d..98dae12 100644
--- a/covertest/run.go
+++ b/covertest/run.go
@@ -9,7 +9,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
 )
 
-// InstrHash maps Instruction with its Script Hash.
+// InstrHash maps instruction with scripthash of a contract it belongs to.
 type InstrHash struct {
 	Offset      int
 	Instruction opcode.Opcode
@@ -17,9 +17,9 @@ type InstrHash struct {
 }
 
 // Run starts execution of the loaded program and accumulates all seen opcodes
-// together with the scripthash they belong to.
+// together with the scripthash of a contract they belong to.
+// Original vm.Run(): https://github.com/nspcc-dev/neo-go/blob/v0.101.3/pkg/vm/vm.go#L418
 func Run(v *vm.VM) ([]InstrHash, error) {
-
 	if !v.Ready() {
 		return nil, errors.New("no program loaded")
 	}
diff --git a/tests/contract_test.go b/tests/contract_test.go
index caa41d8..6f9dc8d 100644
--- a/tests/contract_test.go
+++ b/tests/contract_test.go
@@ -20,7 +20,7 @@ import (
 
 const ctrPath = "../impulse"
 
-// Key for tests
+// keys for tests
 var (
 	validKey   = []byte{1, 2, 3, 4, 5}
 	invalidKey = []byte{1, 2, 3}
@@ -63,22 +63,22 @@ func TestRun(t *testing.T) {
 
 	someNum := getNumToPut()
 
-	// setting up a VM for covertest.Run()
+	// set up a VM for covertest.Run()
 	covertestRunVM := setUpVMForPut(t, e, ctrDI.Contract, hasResult, startOffsetPutNumber, someNum, invalidKey)
 	res, covErr := covertest.Run(covertestRunVM)
 	t.Log("Printing collected instructions:")
 	spew.Dump(res)
 	t.Log("covertest.Run() returned an error: ", covErr)
 
-	// setting up a VM for vm.Run()
+	// set up a VM for vm.Run()
 	origRunVM := setUpVMForPut(t, e, ctrDI.Contract, hasResult, startOffsetPutNumber, someNum, invalidKey)
 	runerr := origRunVM.Run()
 	t.Log("vm.Run() returned an error: ", covErr)
 
-	//check if errors are the same
+	// check if errors are the same
 	require.Equal(t, runerr.Error(), covErr.Error())
 
-	//check if the number of elements on the stack is the same
+	// check if the number of elements on the stack is the same
 	require.Equal(t, origRunVM.Estack().Len(), covertestRunVM.Estack().Len())
 }