diff --git a/docs/financial/PaymentAPI.md b/docs/financial/PaymentAPI.md
index 544807ccb83bec2c399b4d0a16fcd15a0def81d4..38eb41ea80b0bee8381ace02aacf36e327aa3c98 100644
--- a/docs/financial/PaymentAPI.md
+++ b/docs/financial/PaymentAPI.md
@@ -1,4 +1,9 @@
-Payment API
+!!! abstract
+    This area of CiviCRM code and documentation is a work-in-progress. Not all features
+    will be documented and the core code underlying this area may change from version
+    to version.
+
+## Payment API
 
 Historically, one recorded a payment against a contribution by changing its payment status, for example from Pending to Completed.