diff --git a/d2common/d2fileformats/d2ds1/ds1_layers.go b/d2common/d2fileformats/d2ds1/ds1_layers.go
index 2af493cc..e7d872ee 100644
--- a/d2common/d2fileformats/d2ds1/ds1_layers.go
+++ b/d2common/d2fileformats/d2ds1/ds1_layers.go
@@ -132,7 +132,7 @@ func (l *ds1Layers) push(t LayerGroupType, layer *Layer) {
 
 	group := l.getLayersGroup(t)
 
-	max := getMaxGroupLen(t)
+	max := GetMaxGroupLen(t)
 
 	if len(*group) < max {
 		*group = append(*group, layer)
@@ -194,7 +194,7 @@ func (l *ds1Layers) insert(t LayerGroupType, idx int, newLayer *Layer) {
 		return
 	}
 
-	if len(*group)+1 > getMaxGroupLen(t) {
+	if len(*group)+1 > GetMaxGroupLen(t) {
 		return
 	}
 
@@ -335,7 +335,8 @@ func (l *ds1Layers) getLayersGroup(t LayerGroupType) (group *layerGroup) {
 	return group
 }
 
-func getMaxGroupLen(t LayerGroupType) (max int) {
+// GetMaxGroupLen returns maximum length of layer group of type given
+func GetMaxGroupLen(t LayerGroupType) (max int) {
 	switch t {
 	case FloorLayerGroup:
 		max = maxFloorLayers
diff --git a/d2common/d2fileformats/d2ds1/ds1_layers_test.go b/d2common/d2fileformats/d2ds1/ds1_layers_test.go
index 2df948cb..97015652 100644
--- a/d2common/d2fileformats/d2ds1/ds1_layers_test.go
+++ b/d2common/d2fileformats/d2ds1/ds1_layers_test.go
@@ -116,7 +116,7 @@ func Test_ds1Layers_Insert(t *testing.T) {
 func ds1LayersInsert(t *testing.T, lt LayerGroupType) {
 	ds1 := DS1{}
 
-	layers := make([]*Layer, getMaxGroupLen(lt)+1)
+	layers := make([]*Layer, GetMaxGroupLen(lt)+1)
 
 	for i := range layers {
 		i := i
@@ -150,7 +150,7 @@ func ds1LayersInsert(t *testing.T, lt LayerGroupType) {
 		insert(i)
 	}
 
-	if len(*group) != getMaxGroupLen(lt) {
+	if len(*group) != GetMaxGroupLen(lt) {
 		t.Fatal("unexpected floor len after setting")
 	}