diff --git a/src/Greeting.tsx b/src/Greeting.tsx
index 3ce2594..0216672 100644
--- a/src/Greeting.tsx
+++ b/src/Greeting.tsx
@@ -1,11 +1,27 @@
 import React from 'react';
 
+/**
+ * Displays a greeting message with the provided name in uppercase.
+ *
+ * @param name - The name to display in the greeting.
+ *
+ * @returns A React element containing the personalized greeting.
+ *
+ * @remark If {@link name} is an empty string, the greeting will display an empty space instead of defaulting to 'Guest'.
+ */
 export function Greeting({ name }: { name: string }) {
   // Introduce a bug: if name is empty, it should say 'Guest', but this is not handled
   return <h2>Hello, {name.toUpperCase()}! Welcome to CodeRabbit review test.</h2>;
 }
 
-// Add a new function with a logic bug
+/**
+ * Returns a greeting message based on the provided hour of the day.
+ *
+ * @param hour - The hour of the day in 24-hour format.
+ * @returns A greeting string corresponding to the time of day, or "Invalid hour" if the hour is 24 or greater.
+ *
+ * @remark For hours between 18 and 23, the function returns "Good night" instead of distinguishing between "Good evening" and "Good night".
+ */
 export function getGreetingTime(hour: number): string {
   if (hour < 12) return 'Good morning';
   if (hour < 18) return 'Good afternoon';