diff --git a/src/main/java/com/houarizegai/calculator/util/ColorUtil.java b/src/main/java/com/houarizegai/calculator/util/ColorUtil.java
index 6ddff86..3c23fb2 100644
--- a/src/main/java/com/houarizegai/calculator/util/ColorUtil.java
+++ b/src/main/java/com/houarizegai/calculator/util/ColorUtil.java
@@ -19,6 +19,20 @@ private ColorUtil() {
      * Color color = hex2Color("#FF0000");
      * // color is now a Color object representing the color red
      */
+    /**
+     * Converts a hexadecimal color code to a Color object.
+     *
+     * @param colorHex the hexadecimal color code to convert
+     * @param dType the type of color code (e.g., "RGB", "CMYK")
+     * @return the Color object representing the hexadecimal color code, or null if the input is null
+     * @throws NumberFormatException if the input hexadecimal color code is not in the correct format
+     * @throws NullPointerException if the dType parameter is null
+     *
+     * Example:
+     * <pre>{@code
+     * Color color = hex2Color("FFA500", "RGB");
+     * }</pre>
+     */
     public static Color hex2Color(String colorHex) {
         return Optional.ofNullable(colorHex )
                 .map(hex -> new Color (
@@ -29,6 +43,20 @@ public static Color hex2Color(String colorHex) {
         
     }
 
+    /**
+     * Converts a hexadecimal color code to a Color object.
+     *
+     * @param colorHex the hexadecimal color code to convert
+     * @param dType the type of color representation (e.g. "RGB", "CMYK")
+     * @return the Color object representing the given hexadecimal color code
+     * @throws NumberFormatException if the input hexadecimal color code is invalid
+     * @throws NullPointerException if the input colorHex is null
+     *
+     * Example:
+     * <pre>{@code
+     * Color color = hex2Color("FFA500", "RGB");
+     * }</pre>
+     */
     public static Color hex2Color(String colorHex, String dType) {
         return Optional.ofNullable(colorHex )
                 .map(hex -> new Color (