Command entry: Particle View 
Click Notes in an event or add a Notes operator to the particle system and then select it.
The Notes operator lets you add a textual comment to any event. It doesn't have any direct effect on the particle system, but it helps you keep track of the overall function of each event.
The user interface appears in the parameters panel, on the right side of the Particle View dialog.
The interface is a simple text box. Click in the box and enter your text.
