diff --git a/engine/src/main/kotlin/io/flamenet/e2e/BackupPayload.kt b/engine/src/main/kotlin/io/flamenet/e2e/BackupPayload.kt
index 7026af2..f94c054 100644
--- a/engine/src/main/kotlin/io/flamenet/e2e/BackupPayload.kt
+++ b/engine/src/main/kotlin/io/flamenet/e2e/BackupPayload.kt
@@ -280,9 +280,12 @@ object BackupPayload {
             s.optString("key").ifEmpty { s.optString("id") }.ifEmpty { s.optLong("at").toString() },
         )
         s.optJSONObject("set")?.let { out.put("set", it) }
-        // The iPhone has no unread mark on a story, so this is ours alone. It
-        // travels anyway: coming back here it is the difference between a strip
-        // that remembers what you watched and one that shows everything as new.
+        // Whether the strip has been watched. This used to be ours alone and
+        // travelled anyway, on the grounds that it was the difference between a
+        // strip remembering what you watched and one showing everything as new.
+        // The iPhone turned out to HAVE the mark and not to be writing it, so
+        // it relit every ring at each launch; both engines carry it now and it
+        // is in the canonical set rather than a divergence.
         if (s.optBoolean("seen", false)) out.put("seen", true)
         return out
     }