diff --git a/discord/ext/commands/parameters.py b/discord/ext/commands/parameters.py
index e1cc9d112..e5a20aaa1 100644
--- a/discord/ext/commands/parameters.py
+++ b/discord/ext/commands/parameters.py
@@ -195,7 +195,7 @@ def parameter(
     .. code-block:: python3
 
         @bot.command()
-        async def wave(to: discord.User = commands.parameter(default=lambda ctx: ctx.author)):
+        async def wave(ctx, to: discord.User = commands.parameter(default=lambda ctx: ctx.author)):
             await ctx.send(f'Hello {to.mention} :wave:')
 
     Parameters