Showing child pages – really simple answer but can’t remember it!

Hey there! I’ve just reinstalled WordPress and cannot for the life of me remember how to do this.

I’m only including certain pages for my navigation. I’ve set up a few other pages that are subpages of said pages. For instance, “about” has the sub pages of “about me” and “about my web site”. I know theres a piece of code that shows the sub pages and its something like

<!– SOMETHING –>

but I can’t find it on the documentation (and believe me I’ve looked through lots).

I’m being blonde I know, but I really can’t remember it. 😛