diff --git a/comid/integrityregisters_test.go b/comid/integrityregisters_test.go
index a914e287..743ae6c4 100644
--- a/comid/integrityregisters_test.go
+++ b/comid/integrityregisters_test.go
@@ -64,6 +64,8 @@ func TestIntegrityRegisters_AddDigests_NOK(t *testing.T) {
 
 func TestIntegrityRegisters_MarshalCBOR_UIntIndex_OK(t *testing.T) {
 	reg, err := prepareRegister(t, "uint")
+	// Below is the partial CBOR Pretty notation to highlight index as uint: unsigned(0) (at line 70)
+
 	// A5                                      # map(5)
 	//    00                                   # unsigned(0)
 	//    81                                   # array(1)
@@ -136,6 +138,8 @@ func TestIntegrityRegisters_MarshalJSON_UIntIndex_OK(t *testing.T) {
 
 func TestIntegrityRegisters_MarshalCBOR_TextIndex_OK(t *testing.T) {
 	reg, err := prepareRegister(t, "text")
+	// Below is the partial CBOR Pretty notation to highlight index as text: "0" (at line 143)
+
 	// A5                                   # map(5)
 	// 61                                   # text(1)
 	//    30                                # "0"