diff --git a/fdroid-sync.py b/fdroid-sync.py
index fab33d6..2e7c2e6 100755
--- a/fdroid-sync.py
+++ b/fdroid-sync.py
@@ -282,11 +282,17 @@ _listing_done = {}
 def sync_listing(app, cfg, tag, apk: Path, locale):
     """Refresh metadata/<packageId>/ from the app repo. True if it changed.
 
-    Refetched on every run rather than only when the release moves, so a
-    description or screenshot corrected upstream without a new release still
-    lands here. Within a run it is done once per tag: the later passes exist to
-    notice a *new* release, and repeating the fetch and the APK icon parse for
-    a tag already handled would be pure waste.
+    Read from the source archive at the *released tag*, not from the default
+    branch, so the listing always describes the build it ships with. The
+    consequence is worth stating plainly: correcting a typo in
+    full_description.txt on main changes nothing here. It takes a new release,
+    or moving the tag.
+
+    Refetched on every run even when the release has not moved, so a tag that
+    was moved in place is still picked up, and so a listing lost to a failed
+    run repairs itself. Within a single run it is done once per tag: the later
+    passes exist to notice a *new* release, and repeating the fetch and the APK
+    icon parse for a tag already handled would be pure waste.
     """
     if _listing_done.get(app["id"]) == tag:
         return False