diff --git a/etc/SIPconfig.xml b/etc/SIPconfig.xml
index 0823ad37be..b2a32d49c5 100644
--- a/etc/SIPconfig.xml
+++ b/etc/SIPconfig.xml
@@ -83,6 +83,7 @@
              inhouse_patron_categories=""
              blocked_item_types="VM|MU"
              seen_on_item_information="mark_found"> <!-- could be "keep_lost", empty to disable -->
+             <!-- show_checkin_message: If enabled, successful checking responses will contain an AF screen message -->
              <!-- lost_block_checkout sets flag if patron has more than the given current checkouts that are lost ( itemlost > 0 by default ) -->
              <!-- lost_block_checkout_value determines the minimum lost item value to count ( that is, the value in items.itemlost ) -->
           <!-- Refer to syspref SIP2SortBinMapping for full explanation of sort bin mapping -->