diff --git a/main.py b/main.py
index c56ce1d..b367321 100644
--- a/main.py
+++ b/main.py
@@ -7,7 +7,9 @@ from discord.ext import commands
 TOKEN = 'MTE1NDc0ODQ3MzE4MzMwNTc4OQ.Gz_Q7u.02sb2YNV_QQy7Bs19roXlB62mjoMKA6y8aubHU' # Bot token (replace with your own)
 DEFAULT_CONFIG_FILE = 'config.ini' # Configuration file with server IDs and study group roles
 DEFAULT_LOG_FILE = 'kruhobot.log' # Log file for the bot
-
+HELP_MESSAGE = """Usage: `!grant_role kruh-## UKCO`
+- Replace `##` with your study group number
+- Replace `UKCO` with your UKCO (8-digit personal number)."""
 
 # Create an instance of the bot
 intents = discord.Intents.default()
@@ -19,39 +21,31 @@ bot = commands.Bot(command_prefix='!', intents=intents)
 logging.basicConfig(filename=DEFAULT_LOG_FILE, level=logging.INFO)
 logger = logging.getLogger("Kruhobot")
 
-
-async def reply_error(ctx: commands.Context, message: str):
-    await reply(ctx, f'**Error:** {message}', True)
+config = ConfigParser()
+config.read(DEFAULT_CONFIG_FILE)
 
 
-async def reply(ctx: commands.Context, message: str):
-    await ctx.send(message)
-
-
-def init(config):
+async def reply_error(ctx, message: str):
     """
-    Initialize the server IDs and study groups from the configuration file.
-    :param config: The configuration file.
-    :return: A tuple with server IDs and study groups.
+    Reply to the user with an error message.
+    :param ctx: The context of the command.
+    :param message: The error message.
     """
-    def get_section_server_id(section):
-        return int(config[section]["server_ID"])
+    await reply(ctx, f'**Error:** {message}')
 
-    server_ids = {get_section_server_id(section) for section in config.sections() if "server_ID" in config[section]}
-    study_groups = {server_id: dict() for server_id in server_ids}
 
-    for section in config.sections():
-        server_id = get_section_server_id(section)
-        if server_id is None:
-            continue
-
-        # Study group names are in style "kruh-XX", where XX is a two-digit number
-        # Iterate over all from top to bottom
-        for (key, value) in config.items(section):
-            if key.startswith('kruh-'):
-                study_groups[server_id][key] = int(value)
-
-    return server_ids, study_groups
+async def reply(ctx, message: str):
+    """
+    Reply to the user.
+    :param ctx: The context of the command or the channel from the event handler.
+    :param message: The message to reply with.
+    """
+    if isinstance(ctx, commands.Context):
+        await ctx.send(message)
+    elif isinstance(ctx, discord.abc.Messageable):
+        await ctx.send(message)
+    else:
+        logger.error(f'Failed to send the following message: "{message}"')
 
 
 @bot.event
@@ -89,21 +83,82 @@ async def grant_role(ctx, study_group_name: str):
     return
 
 
+def check_command(message):
+    # Split the message content into words
+    words = message.content.split()
+
+    if len(words) == 0:
+        return False
+
+    # Check if the message is a command
+    if not words[0].startswith('!'):
+        reply(message.channel, HELP_MESSAGE)
+        return False
+
+    # Check if the command is recognized
+    if not words[0] == '!grant_role':
+        reply_error(message.channel, 'Unrecognized command.')
+        reply(message.channel, HELP_MESSAGE)
+        return False
+
+    # Check if the number of arguments is correct
+    if not len(words) == 3:
+        reply_error(message.channel, 'Invalid number of arguments.')
+        reply(message.channel, HELP_MESSAGE)
+        return False
+
+    # Check study group format
+    if not words[1].startswith('kruh-') or not words[1][5:].isdigit():
+        reply_error(message.channel, 'Invalid study group format.')
+        reply(message.channel, HELP_MESSAGE)
+        return False
+
+    if not words[2].isdigit() or not len(words[2]) == 8:
+        reply_error(message.channel, 'Invalid UKCO format.')
+        reply(message.channel, HELP_MESSAGE)
+        return False
+
+    return True
+
+
 @bot.event
 async def on_message(message):
     # Check if the message is a private message and not from the bot itself
-    if isinstance(message.channel, discord.DMChannel) and message.author != bot.user:
-        # Split the message content into words
-        words = message.content.split()
+    if not isinstance(message.channel, discord.DMChannel) or message.author == bot.user:
+        return
 
-        # Check if the message starts with the bot's command prefix and has enough arguments
-        if len(words) >= 3 and words[0] == '!grant_role':
-            # Process the command
-            await bot.process_commands(message)
+    is_valid_command = check_command(message)
+    if not is_valid_command:
+        return
+
+    await bot.process_commands(message)
 
 
-config = ConfigParser()
-config.read(DEFAULT_CONFIG_FILE)
+def init(config):
+    """
+    Initialize the server IDs and study groups from the configuration file.
+    :param config: The configuration file.
+    :return: A tuple with server IDs and study groups.
+    """
+    def get_section_server_id(section):
+        return int(config[section]["server_ID"])
+
+    server_ids = {get_section_server_id(section) for section in config.sections() if "server_ID" in config[section]}
+    study_groups = {server_id: dict() for server_id in server_ids}
+
+    for section in config.sections():
+        server_id = get_section_server_id(section)
+        if server_id is None:
+            continue
+
+        # Study group names are in style "kruh-XX", where XX is a two-digit number
+        # Iterate over all from top to bottom
+        for (key, value) in config.items(section):
+            if key.startswith('kruh-'):
+                study_groups[server_id][key] = int(value)
+
+    return server_ids, study_groups
+
 
 server_ids, study_groups = init(config)