diff --git a/src/duplicacy_s3storage.go b/src/duplicacy_s3storage.go
index 01d5e9f..e29af95 100644
--- a/src/duplicacy_s3storage.go
+++ b/src/duplicacy_s3storage.go
@@ -2,6 +2,11 @@
 // Free for personal use and commercial trial
 // Commercial use requires per-user licenses available from https://duplicacy.com
 
+// NOTE: The code in the Wasabi storage module relies on all functions
+// in this one except MoveFile(), IsMoveFileImplemented() and
+// IsStrongConsistent().  Changes to the API here will need to be
+// reflected there.
+
 package duplicacy
 
 import (