diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index 6d64af90c..8ee6e6e90 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -445,6 +445,7 @@ func (i *Image) readPixelsFromGPUIfNeeded() {
 // Note that this must not be called until context is available.
 func (i *Image) At(x, y int) (byte, byte, byte, byte) {
 	// As this should not affect the information for restoring, this doesn't have to be deferred.
+	// TODO: If there are deferred operations, At doesn't return the correct color. Fix this (#913).
 
 	w, h := i.image.Size()
 	if x < 0 || y < 0 || w <= x || h <= y {