diff --git a/person-identifiers.adoc b/person-identifiers.adoc
index fcc80c2..953f69a 100644
--- a/person-identifiers.adoc
+++ b/person-identifiers.adoc
@@ -22,6 +22,8 @@ identifier characteristics: Definitive statement for HE and Research: https://wi
 
 . unique across the IdPs population Y/N
 
+*Grouper*
+
 ~ does have its own internal-only identifier +
 ~  identifier is a tuple, sourceID + personID from that source +
 ~  enter ePPN, or link in email for new ppl being added +