diff --git a/lib/ui/painting.dart b/lib/ui/painting.dart
index ca21fcc4e29c2..eff01d44bd2c4 100644
--- a/lib/ui/painting.dart
+++ b/lib/ui/painting.dart
@@ -2493,16 +2493,18 @@ class ColorFilter {
         _matrix = null,
         _type = _TypeMode;
 
-  /// Construct a color filter that transforms a color by a 4x5 matrix.
+  /// Construct a color filter that transforms a color by a 5x5 matrix, where
+  /// the fifth row is implicitly added in an identity configuration.
   ///
   /// Every pixel's color value, repsented as an `[R, G, B, A]`, is matrix
   /// multiplied to create a new color:
   ///
-  /// ```
+  /// ```text
   /// | R' |   | a00 a01 a02 a03 a04 |   | R |
-  /// | G' | = | a10 a11 a22 a33 a44 | * | G |
-  /// | B' |   | a20 a21 a22 a33 a44 |   | B |
+  /// | G' |   | a10 a11 a22 a33 a44 |   | G |
+  /// | B' | = | a20 a21 a22 a33 a44 | * | B |
   /// | A' |   | a30 a31 a22 a33 a44 |   | A |
+  /// | 1  |   |  0   0   0   0   1  |   | 1 |
   /// ```
   ///
   /// The matrix is in row-major order and the translation column is specified