diff --git a/ofdgo_font_util.go b/ofdgo_font_util.go
index cbd9d5e..02bf04f 100644
--- a/ofdgo_font_util.go
+++ b/ofdgo_font_util.go
@@ -569,7 +569,7 @@ func shouldBuildCmapFormat12(mapping map[rune]uint16) bool {
 		glyphIDCount++
 		prev = curr
 	}
-	segCount++ // sentinel segment
+	segCount++
 	length := 16 + segCount*8 + glyphIDCount*2
 	return length > 0xFFFF
 }
diff --git a/ofdgo_renderer_layer.go b/ofdgo_renderer_layer.go
index 0a0949a..ee8a7ae 100644
--- a/ofdgo_renderer_layer.go
+++ b/ofdgo_renderer_layer.go
@@ -126,7 +126,6 @@ func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu Composite
 	currentCTM := boundaryCTM.Multiply(NewMatrix(cgu.CTM))
 	clips, clipCTM := cgu.Clips, currentCTM
 	if clips != nil && clips.TransFlag != nil && !*clips.TransFlag {
-		// 不参与对象CTM的裁剪仍位于对象边界及父级坐标系中
 		clipCopy := *clips
 		clipCopy.TransFlag = nil
 		clips, clipCTM = &clipCopy, boundaryCTM