# Designing the nameModifier
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Design the `nameModifier` portions of the file name. The child manifests and media files include this modifier in their file names. 

This `nameModifier` distinguishes each output from the other, so it must be unique in each output. 
+ For an output that contains video (and possibly other streams), you typically describe the video. For example, if you have three renditions, you might use **-high**, **-medium** and **-low**. Or each modifier could accurately describe the resolution and the bitrate (**-1920x1080-5500kpbs**).
+ For an output that contains only audio or only captions, you typically describe the audio or captions. For example, **-aac** or **-webVTT**.

It’s a good idea to start the `nameModifier` with a delimiter, such as a hyphen, in order to separate the` baseFilename` from the `nameModifier`.

The `nameModifier` can include [data variables](variable-data-identifiers.md).