diff --git a/src/PhpSpreadsheet/Calculation/Financial/Dollar.php b/src/PhpSpreadsheet/Calculation/Financial/Dollar.php
index e6a0392a..7bebb391 100644
--- a/src/PhpSpreadsheet/Calculation/Financial/Dollar.php
+++ b/src/PhpSpreadsheet/Calculation/Financial/Dollar.php
@@ -7,6 +7,17 @@ use PhpOffice\PhpSpreadsheet\Calculation\TextData\Format;
 
 class Dollar
 {
+    /**
+     * DOLLAR.
+     *
+     * This function converts a number to text using currency format, with the decimals rounded to the specified place.
+     * The format used is $#,##0.00_);($#,##0.00)..
+     *
+     * @param mixed $number The value to format
+     * @param mixed $precision The number of digits to display to the right of the decimal point (as an integer).
+     *                            If precision is negative, number is rounded to the left of the decimal point.
+     *                            If you omit precision, it is assumed to be 2
+     */
     public static function format($number, $precision = 2): string
     {
         return Format::DOLLAR($number, $precision);