diff --git a/lib/pinchflat/downloading/media_retention_worker.ex b/lib/pinchflat/downloading/media_retention_worker.ex
index 6f97cbd..0835438 100644
--- a/lib/pinchflat/downloading/media_retention_worker.ex
+++ b/lib/pinchflat/downloading/media_retention_worker.ex
@@ -50,7 +50,6 @@ defmodule Pinchflat.Downloading.MediaRetentionWorker do
   end
 
   defp delete_media_items_from_before_cutoff do
-    # TODO: update the source form to explain this new behavior
     deletable_media =
       MediaQuery.new()
       |> MediaQuery.require_assoc(:source)
diff --git a/lib/pinchflat_web/controllers/sources/source_html/source_form.html.heex b/lib/pinchflat_web/controllers/sources/source_html/source_form.html.heex
index 93c29be..409b328 100644
--- a/lib/pinchflat_web/controllers/sources/source_html/source_form.html.heex
+++ b/lib/pinchflat_web/controllers/sources/source_html/source_form.html.heex
@@ -94,7 +94,7 @@
       maxlength="10"
       pattern="((?:19|20)[0-9][0-9])-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])"
       title="YYYY-MM-DD"
-      help="Only download media uploaded after this date. Leave blank to download all media. Must be in YYYY-MM-DD format"
+      help="Only download media uploaded after this date. Leave blank to download all media. Must be in YYYY-MM-DD format. Old media may be deleted or downloaded if you change this date"
     />
 
     <.input