diff --git a/d2renderers/d2svg/d2svg.go b/d2renderers/d2svg/d2svg.go
index c81a75f81..d2f41b9d7 100644
--- a/d2renderers/d2svg/d2svg.go
+++ b/d2renderers/d2svg/d2svg.go
@@ -984,7 +984,7 @@ func Render(diagram *d2target.Diagram) ([]byte, error) {
 	// SVG has no notion of z-index. The z-index is effectively the order it's drawn.
 	// So draw from the least nested to most nested
 	idToShape := make(map[string]d2target.Shape)
-	allObjects := make([]d2target.DiagramObject, 0, len(diagram.Shapes)+len(diagram.Connections))
+	allObjects := make([]DiagramObject, 0, len(diagram.Shapes)+len(diagram.Connections))
 	for _, s := range diagram.Shapes {
 		idToShape[s.ID] = s
 		allObjects = append(allObjects, s)
@@ -1005,7 +1005,7 @@ func Render(diagram *d2target.Diagram) ([]byte, error) {
 				return nil, err
 			}
 		} else {
-			return nil, fmt.Errorf("unknow object of type %t", obj)
+			return nil, fmt.Errorf("unknow object of type %T", obj)
 		}
 	}
 
@@ -1015,13 +1015,18 @@ func Render(diagram *d2target.Diagram) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
+type DiagramObject interface {
+	GetID() string
+	GetZIndex() int
+}
+
 // sortObjects sorts all diagrams objects (shapes and connections) in the desired drawing order
 // the sorting criteria is:
 // 1. zIndex, lower comes first
 // 2. two shapes with the same zIndex are sorted by their level (container nesting), containers come first
 // 3. two shapes with the same zIndex and same level, are sorted in the order they were exported
 // 4. shape and edge, shapes come first
-func sortObjects(allObjects []d2target.DiagramObject) {
+func sortObjects(allObjects []DiagramObject) {
 	sort.SliceStable(allObjects, func(i, j int) bool {
 		// first sort by zIndex
 		iZIndex := allObjects[i].GetZIndex()
@@ -1030,7 +1035,7 @@ func sortObjects(allObjects []d2target.DiagramObject) {
 			return iZIndex < jZIndex
 		}
 
-		// then, if both are shapes, the containers come first
+		// then, if both are shapes, parents come before their children
 		iShape, iIsShape := allObjects[i].(d2target.Shape)
 		jShape, jIsShape := allObjects[j].(d2target.Shape)
 		if iIsShape && jIsShape {
diff --git a/d2renderers/d2svg/d2svg_test.go b/d2renderers/d2svg/d2svg_test.go
index 5730edbb2..2d99dfe32 100644
--- a/d2renderers/d2svg/d2svg_test.go
+++ b/d2renderers/d2svg/d2svg_test.go
@@ -7,7 +7,7 @@ import (
 )
 
 func TestSortObjects(t *testing.T) {
-	allObjects := []d2target.DiagramObject{
+	allObjects := []DiagramObject{
 		// same zIndex and level, should keep in this order
 		d2target.Shape{
 			ID:     "0",
@@ -57,7 +57,7 @@ func TestSortObjects(t *testing.T) {
 		},
 	}
 
-	expectedOrder := []d2target.DiagramObject{
+	expectedOrder := []DiagramObject{
 		allObjects[8],
 		allObjects[0],
 		allObjects[1],
diff --git a/d2target/d2target.go b/d2target/d2target.go
index dd386c72d..3f749fa87 100644
--- a/d2target/d2target.go
+++ b/d2target/d2target.go
@@ -17,11 +17,6 @@ const (
 	MAX_ICON_SIZE     = 64
 )
 
-type DiagramObject interface {
-	GetID() string
-	GetZIndex() int
-}
-
 type Diagram struct {
 	Name        string `json:"name"`
 	Description string `json:"description,omitempty"`