diff --git a/changes/1457.source_catalog.rst b/changes/1457.source_catalog.rst
new file mode 100644
index 000000000..1d93d4b9a
--- /dev/null
+++ b/changes/1457.source_catalog.rst
@@ -0,0 +1,2 @@
+The input datamodel to the source_catalog step is now copied so that it
+is left completely unchanged by the step.