1 files changed, 3 insertions, 0 deletions
diff --git a/skia/ext/canvas_paint_x.h b/skia/ext/canvas_paint_x.h
index e8e3c68..a714a2e 100644
--- a/skia/ext/canvas_paint_x.h
+++ b/skia/ext/canvas_paint_x.h
@@ -17,6 +17,7 @@ namespace skia {
 // A class designed to translate skia painting into a region in a Wayland window
 // surface. On construction, it will set up a context for painting into, and on
 // destruction, it will commit it to the Wayland window surface.
+// Note: The created context is always inialized to (0, 0, 0, 0).
 template <class T>
 class CanvasPaintT : public T {
  public:
@@ -88,6 +89,8 @@ class CanvasPaintT : public T {
       // Cause a deliberate crash;
       CHECK(false);
     }
+    // No need to clear the canvas, because cairo automatically performs the
+    // clear.
 
     // Need to translate so that the dirty region appears at the origin of the
     // surface.