diff --git a/CMYK.zig b/CMYK.zig
index 8fae9001f2192531bfd183f52bc56a4773218328..9cb3e8b06410ee1caa00f54add190791ee9f4834 100644
--- a/CMYK.zig
+++ b/CMYK.zig
@@ -4,11 +4,11 @@ const std = @import("std");
 const Self = @This();
 const color = @import("./mod.zig");
 
-c: f32, // cyan
-m: f32, // magenta
-y: f32, // yellow
-k: f32, // black
-a: f32, // alpha
+c: f32, // cyan     [ 0 .. 1 ]
+m: f32, // magenta  [ 0 .. 1 ]
+y: f32, // yellow   [ 0 .. 1 ]
+k: f32, // black    [ 0 .. 1 ]
+a: f32, // alpha    [ 0 .. 1 ]
 
 pub fn initCMYKA(c: f32, m: f32, y: f32, k: f32, a: f32) Self {
     std.debug.assert(c >= 0.0 and c <= 1.0);
diff --git a/HSL.zig b/HSL.zig
index 10e5c1f490dad89f196d8182c3085169e8828fc4..72aeef11f0ddf065262c94198e52405651a0b054 100644
--- a/HSL.zig
+++ b/HSL.zig
@@ -5,10 +5,10 @@ const Self = @This();
 const color = @import("./mod.zig");
 const _x = @import("./_x.zig");
 
-h: f32, // hue
-s: f32, // saturation
-l: f32, // luminance
-a: f32, // alpha
+h: f32, // hue         [ 0 .. 1 ]
+s: f32, // saturation  [ 0 .. 1 ]
+l: f32, // luminance   [ 0 .. 1 ]
+a: f32, // alpha       [ 0 .. 1 ]
 
 pub fn initHSLA(h: f32, s: f32, l: f32, a: f32) Self {
     std.debug.assert(h >= 0.0 and h <= 1.0);
diff --git a/HSV.zig b/HSV.zig
index 35d0a702d218b2d01fe701bdd07169c47801e8a9..7c41894f0c74df8624ada522d5fb9a96f823773a 100644
--- a/HSV.zig
+++ b/HSV.zig
@@ -5,10 +5,10 @@ const Self = @This();
 const color = @import("./mod.zig");
 const _x = @import("./_x.zig");
 
-h: f32, // hue
-s: f32, // saturation
-v: f32, // value
-a: f32, // alpha
+h: f32, // hue         [ 0 .. 1 ]
+s: f32, // saturation  [ 0 .. 1 ]
+v: f32, // value       [ 0 .. 1 ]
+a: f32, // alpha       [ 0 .. 1 ]
 
 pub fn initHSVA(h: f32, s: f32, v: f32, a: f32) Self {
     std.debug.assert(h >= 0.0 and h <= 1.0);
diff --git a/LinearRgb.zig b/LinearRgb.zig
index 4adff842597ece93bf30cf63cf4a50df47c02054..689aa841e23f76c8792f80d2f526cbd13756e831 100644
--- a/LinearRgb.zig
+++ b/LinearRgb.zig
@@ -6,10 +6,10 @@ const color = @import("./mod.zig");
 const _x = @import("./_x.zig");
 const vec4 = @Vector(4, f32);
 
-r: f32, // red
-g: f32, // green
-b: f32, // blue
-a: f32, // alpha
+r: f32, // red    [ 0 .. 1]
+g: f32, // green  [ 0 .. 1]
+b: f32, // blue   [ 0 .. 1]
+a: f32, // alpha  [ 0 .. 1]
 
 pub fn initRGBA(r: f32, g: f32, b: f32, a: f32) Self {
     std.debug.assert(r >= 0.0 and r <= 1.0);