diff --git a/cmd/yamltool/diff.go b/cmd/yamltool/diff.go
index 63fa450..58e8cea 100644
--- a/cmd/yamltool/diff.go
+++ b/cmd/yamltool/diff.go
@@ -20,15 +20,19 @@ func subtract(yaml2 yaml.MapSlice, yaml1 yaml.MapSlice) yaml.MapSlice {
 		v2 := item.Value
 		v1 := yaml1.ToMap()[k]
 		switch {
+		case v2 != nil && v1 == nil:
+			res = append(res, item)
 		case reflect.DeepEqual(v1, v2):
 			// delete is implicit by not copying to the output
-		case Type(v1) == Map && Type(v2) == Map:
+		case reflect.TypeOf(v1) == reflect.TypeOf(yaml.MapSlice{}) &&
+			reflect.TypeOf(v2) == reflect.TypeOf(yaml.MapSlice{}):
 			diff := subtract(v2.(yaml.MapSlice), v1.(yaml.MapSlice))
 			if len(diff) > 0 {
-				res = append(res, item)
+				mi := yaml.MapItem{Key: k, Value: diff}
+				res = append(res, mi)
 			}
 		case Type(v1) == Slice && Type(v2) == Slice:
-
+			// To be improved can be really confusing.
 			v2set := make(map[string]bool)
 			v1set := make(map[string]bool)
 			stringToValue := make(map[any]any)