Merge pull request #6754 from segmentio/charholt-patch-1

Update portal.md

Author: cmastr

src/privacy/portal.md

@@ -89,6 +89,8 @@ When Segment detects data that meets the criteria for one of the default
 matchers (in the list above) in properties in your Web, Mobile, Server, or Cloud
 Event Sources, we display it in the [Privacy Portal Inbox](#privacy-inbox).
 
+Default PII matchers are currently uneditable. If you want to change the behavior of a default matcher, you can create a custom PII matcher that replicates and overwrites the default matcher.
+
 ### Custom PII Matchers
 
 This is where you can create your very own matchers to tell Segment what to scan