diff --git a/person-identifiers.adoc b/person-identifiers.adoc
index b588940..ed441b1 100644
--- a/person-identifiers.adoc
+++ b/person-identifiers.adoc
@@ -22,7 +22,7 @@ https://wiki.shibboleth.net/confluence/display/CONCEPT/NameIdentifiers
 
 ==== Unique across the IdPs population Y/N?
 
-  identifier is a tuple, sourceID + personID from that source
+  In COmanage, external identifier are tuples: {Identifier for the external source, PersonID assigned by that source}
   enter ePPN, or link in email for new ppl being added
   id to label person in system, but also identifiers for looking them up: email, name,....LoginID
   id and identifier (anything that can uniquely identify a person