diff --git a/extensions/greetings.py b/extensions/greetings.py
index fad6c64..f8229a8 100644
--- a/extensions/greetings.py
+++ b/extensions/greetings.py
@@ -28,7 +28,7 @@ class Greetings(commands.Cog):
 
     @greetings.group("help", pass_context=True)
     async def greetings_help(self, ctx: commands.Context):
-        embed = Embed(title="greetings help")
+        embed = Embed(title="Greetings help")
         embed.add_field(name="set <join/leave> <message>", value="Set the greetings message\n"
                                                                  "`{}` will be replace by the username",
                         inline=False)
diff --git a/extensions/help.py b/extensions/help.py
index 2e71cbf..f2e38bb 100644
--- a/extensions/help.py
+++ b/extensions/help.py
@@ -1,8 +1,10 @@
+from discord import Embed
 from discord.ext import commands
 from discord.ext.commands import CommandNotFound, MissingRequiredArgument, BadArgument, MissingPermissions
 
+from administrator import config
 from administrator.logger import logger
-from administrator.check import NotOwner
+from administrator.check import NotOwner, is_owner
 
 
 extension_name = "help"
@@ -16,7 +18,29 @@ class Help(commands.Cog):
 
     @commands.command("help", pass_context=True)
     async def help(self, ctx: commands.Context):
-        await ctx.send("HALP !")
+        embed = Embed(title="Help")
+        embed.add_field(name="Poll", value="Create poll with a simple command\n"
+                                           f"`{config.get('prefix')}poll help` for more information", inline=False)
+        embed.add_field(name="Reminders", value="Create reminders\n"
+                                                f"`{config.get('prefix')}reminder help` for more information",
+                        inline=False)
+        permissions = ctx.channel.permissions_for(ctx.author)
+        if permissions.manage_messages:
+            embed.add_field(name="Purge", value="Purge all messages between the command and the next add reaction\n"
+                                                f"`{config.get('prefix')}purge help` for more information", inline=False)
+        if permissions.manage_guild:
+            embed.add_field(name="Greetings", value="Setup join and leave message\n"
+                                                    f"`{config.get('prefix')}greetings help` for more information",
+                            inline=False)
+            embed.add_field(name="Presentation", value="Give role to user who make a presentation in a dedicated "
+                                                       "channel\n"
+                                                       f"`{config.get('prefix')}presentation help` for more information",
+                            inline=False)
+        if await is_owner(ctx):
+            embed.add_field(name="Extension", value="Manage bot extensions\n"
+                                                    f"`{config.get('prefix')}extension help` for more information",
+                            inline=False)
+        await ctx.send(embed=embed)
 
     @commands.Cog.listener()
     async def on_command_error(self, ctx: commands.Context, error):
diff --git a/extensions/poll.py b/extensions/poll.py
index a47bbf0..d76e42a 100644
--- a/extensions/poll.py
+++ b/extensions/poll.py
@@ -48,7 +48,7 @@ class Poll(commands.Cog):
     @poll.group("help", pass_context=True)
     @commands.guild_only()
     async def poll_help(self, ctx: commands.Context):
-        embed = Embed(title="poll help")
+        embed = Embed(title="Poll help")
         embed.add_field(name="poll <name> [multi|m] <Choice N°1> <Choice N°2> ... <Choice N°11>",
                         value="Create a poll, the argument multi (or m) after the name allow multiple response\n"
                               "User the \U0001F5D1 to close the poll",
diff --git a/extensions/presentation.py b/extensions/presentation.py
index ab6148e..1e78527 100644
--- a/extensions/presentation.py
+++ b/extensions/presentation.py
@@ -23,7 +23,7 @@ class Presentation(commands.Cog):
 
     @presentation.group("help", pass_context=True)
     async def presentation_help(self, ctx: commands.Context):
-        embed = Embed(title="greetings help", description="Give a role to a new member after a presentation")
+        embed = Embed(title="Presentation help", description="Give a role to a new member after a presentation")
         embed.add_field(name="set <#channel> <@role>", value="Set the presentation channel and the role to give",
                         inline=False)
         embed.add_field(name="disable", value="Disable the auto role give", inline=False)
diff --git a/extensions/purge.py b/extensions/purge.py
index 3fcc6ec..eaba4ce 100644
--- a/extensions/purge.py
+++ b/extensions/purge.py
@@ -17,21 +17,19 @@ class Purge(commands.Cog):
 
     @commands.group("purge", pass_context=True)
     @commands.guild_only()
+    @commands.has_permissions(manage_messages=True)
     async def purge(self, ctx: commands.Context):
         if ctx.invoked_subcommand is None:
-            if ctx.message.channel.permissions_for(ctx.author).manage_messages:
-                self.purges[ctx.message.author.id] = ctx.message
-                await ctx.message.add_reaction("\U0001f44d")
+            self.purges[ctx.message.author.id] = ctx.message
+            await ctx.message.add_reaction("\U0001f44d")
 
-                await sleep(2*60)
-                try:
-                    if self.purges[ctx.message.author.id] == ctx.message:
-                        await ctx.message.clear_reactions()
-                        del self.purges[ctx.message.author.id]
-                except:
-                    pass
-            else:
-                await ctx.message.add_reaction("\u274C")
+            await sleep(2*60)
+            try:
+                if self.purges[ctx.message.author.id] == ctx.message:
+                    await ctx.message.clear_reactions()
+                    del self.purges[ctx.message.author.id]
+            except:
+                pass
 
     @purge.group("help", pass_context=True)
     @commands.guild_only()