You won't do it "later"...
GNOME Documentation Style Guide
Things to avoid:
http://www.nngroup.com/articles/how-users-read-on-the-web/
http://www.nngroup.com/articles/be-succinct-writing-for-the-web/
Easy to read, easy to write :)
Think about translators
The Foobar applet is a handy little screen grabber.
The Foobar applet is a handy little screen grabber.
You use the Foobar applet to take screenshots.
→ be neutral, be consistent
In the menu tree you will notice that there are two main menu lists.
In the menu tree you will notice that there are two main menu lists.
The menu tree contains two main menu lists.
→ use present tense, and active voice, avoid "there are"
If you would like to place a menu item onto the panel, you can drag and drop from the menu to the panel and it will place a launcher there with all the appropriate properties set for you.
If you would like to place a menu item onto the panel, you can drag and drop from the menu to the panel and it will place a launcher there with all the appropriate properties set for you.
You can drag a menu item from the menu to the panel. The drag action places a launcher on the panel with all the appropriate properties set.
→ split big sentences, be factual, keep it short