diff --git a/src/main/java/ByteGrayColor.java b/src/main/java/ByteGrayColor.java
index 70e3b97a3989eb45aab82518b73e6d0003428733..c3e784b77e7ca29d6f935511a4edeb930551d765 100644
--- a/src/main/java/ByteGrayColor.java
+++ b/src/main/java/ByteGrayColor.java
@@ -10,6 +10,8 @@ public class ByteGrayColor implements GrayColor {
     private static final int MAXIMUM_GRAY_LEVEL = 255;
     private static final int OPACITY = 1;
 
+    // TODO : add static ByteGrayColors WHITE and BLACK
+
     private final int grayLevel;