diff --git a/models/_docs/docs.md b/models/_docs/docs.md
index 446d19b..b9cd7d0 100644
--- a/models/_docs/docs.md
+++ b/models/_docs/docs.md
@@ -103,7 +103,7 @@ The datetime of the event sink run that published this block to ClickHouse. When
 {% enddocs %}
 
 {% docs username %}
-The username of the learner
+The username of the learner from the LMS user table. When Aspects PII syncing is off this will be empty.
 {% enddocs %}
 
 {% docs verb_id %}