diff --git a/src/Color.hpp b/src/Color.hpp
index 7d4fcb5..12f5429 100644
--- a/src/Color.hpp
+++ b/src/Color.hpp
@@ -4,15 +4,15 @@
 #include <string>
 
 struct RGB {
-    double r;
-    double g;
-    double b;
+    double r; // 0..1
+    double g; // 0..1
+    double b; // 0..1
 };
 
 struct HSB {
-    double h;
-    double s;
-    double b;
+    double h; // 0..360
+    double s; // 0..1
+    double b; // 0..1
 };
 
 class Color {