help file - bracket in a cmd line

[FLuca]

How can I insert a left bracket in the command line of a help file?

In the help file, I am writing a loop for an example; I am trying to display the following command line that starts the loop:

forval i =1(1) `N' {

I wrote the following:

{phang2}{cmd: forval i =1(1) `N' {    }{p_end}

However, when I open the help file I see:

{cmd: forval i =1(1) `N' { }

Surprisingly (to me), I do not encounter the same issue when I close the loop.
I write:

{phang2}{cmd: }        }{p_end}

And when I open the help file I see:

}