diff --git a/.changeset/rich-goats-breathe.md b/.changeset/rich-goats-breathe.md
index de8942c248..2888c2f9a7 100644
--- a/.changeset/rich-goats-breathe.md
+++ b/.changeset/rich-goats-breathe.md
@@ -3,3 +3,5 @@
 ---
 
 **BREAKING**: Update FactRetrieverRegistry interface to be async so that db backed implementations can be passed through to the FactRetrieverEngine.
+
+If you have existing custom `FactRetrieverRegistry` implementations, you'll need to remove the `retrievers` member and make all the methods async.