diff --git a/discord/ext/commands/help.py b/discord/ext/commands/help.py
index 812b674ed..cafc20f32 100644
--- a/discord/ext/commands/help.py
+++ b/discord/ext/commands/help.py
@@ -598,7 +598,7 @@ class HelpCommand:
 
         Parameters
         ------------
-        mapping: Mapping[Optional[:class:`Cog`], List[:class:`Command`]
+        mapping: Mapping[Optional[:class:`Cog`], List[:class:`Command`]]
             A mapping of cogs to commands that have been requested by the user for help.
             The key of the mapping is the :class:`~.commands.Cog` that the command belongs to, or
             ``None`` if there isn't one, and the value is a list of commands that belongs to that cog.