diff --git a/source/includes/copy-existing-admonition.rst b/source/includes/copy-existing-admonition.rst
index 1c51d141..221f1840 100644
--- a/source/includes/copy-existing-admonition.rst
+++ b/source/includes/copy-existing-admonition.rst
@@ -2,4 +2,5 @@ If any system changes the data in the database while the source connector
 converts existing data from it, MongoDB may produce duplicate change
 stream events to reflect the latest changes.  Since the change stream
 events on which the data copy relies are idempotent, the copied data is
-eventually consistent.
+eventually consistent, conformant to an "at-least-once" delivery guarantee.
+