# Code explination please

**URL:** <https://forum.kirupa.com/t/code-explination-please/188362>\
**Category:** Uncategorized\
**Created:** [May 7, 2006, 12:43am UTC](https://forum.kirupa.com/t/code-explination-please/188362 "2006-05-07T00:43:31Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Dhryn](https://avatars.discourse-cdn.com/v4/letter/d/47e85d/32.png) [@Dhryn](https://forum.kirupa.com/u/Dhryn)\
**Post date:** [May 7, 2006, 12:43am UTC](https://forum.kirupa.com/t/code-explination-please/188362/1 "2006-05-07T00:43:31Z")

</div>

what does

```auto
jump -= .5;

```

mean in the following code.

```auto
if (jumping) {
            this.gotoAndStop("jump");
            this._y -= jump;
            jump -= .5;
            if (jump<0) {
                falling = true;
            }
            if (jump<-15) {
                jump = -15;
            }

```