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2 changes: 2 additions & 0 deletions docs/custom-props/introduction.md
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Expand Up @@ -35,6 +35,8 @@ Note that you must ensure that no personally identifiable information (PII) is s
* IP addresses
* pseudonymous cookie IDs, advertising IDs or other pseudonymous end user identifiers

If you're confused whether the information you're sending to us qualifies as PII, look at the [explanations and examples](https://plausible.io/blog/pii-examples) in our guide.

## `(none)` values

Plausible will display `(none)` in your dashboard when you send a custom property key with no value, or `null`/`undefined` as a value. Also, when you send one event with a property (e.g. `author`) and another event with the same name, but without the `author` property, then you will also see the `(none)` value because the property has not been sent with every event.
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