Optional arguments now taken into account.

src/main/java/net/pingex/discordbot/InternalCommandsModule.java

@@ -57,9 +57,14 @@ class InternalCommandsModule extends AbstractModule
 		}
 
 		toReturn.append("\nUsage: ").append(Configuration.getValue("general", "commandPrefix")).append(command);
-		for(Class<?> i : matchingMethod.getMethod().getParameterTypes())
-			if(i != MessageReceivedEvent.class)
-				toReturn.append(" <").append(i.getName()).append(">");
+
+		for(int i=1; i < matchingMethod.getMethod().getParameterCount(); i++)
+		{
+			// Try to know if the field is required (or not) from the Command annotation
+			String brackets = "<>";
+			try { if(!matchingMethod.getMethod().getAnnotation(Command.class).required()[i-1]) brackets = "[]"; } catch (ArrayIndexOutOfBoundsException e) {}
+			toReturn.append(" ").append(brackets.charAt(0)).append(matchingMethod.getMethod().getParameterTypes()[i].getSimpleName()).append(brackets.charAt(1));
+		}
 
 		return toReturn.toString();
 	}