diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
index e2c69dadb3973e4ba95cc5e06bb55757ae53f360..f024779948494f7b089c79d3a3faccde05d8ed70 100644
--- a/lib/ui/painting.dart
+++ b/lib/ui/painting.dart
@@ -33,6 +33,11 @@ Color _scaleAlpha(Color a, double factor) {
 /// Color c1 = const Color(0xFFFFFF); // fully transparent white (invisible)
 /// Color c2 = const Color(0xFFFFFFFF); // fully opaque white (visible)
 /// ```
+///
+/// See also:
+///
+///  * [Colors](https://docs.flutter.io/flutter/material/Colors-class.html), which
+///    defines the colors found in the Material Design specification.
 class Color {
   /// Construct a color from the lower 32 bits of an [int].
   ///