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-rw-r--r--docs/devel/replay.rst3
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diff --git a/docs/devel/replay.rst b/docs/devel/replay.rst
index effd856f0c..40f58d9d4f 100644
--- a/docs/devel/replay.rst
+++ b/docs/devel/replay.rst
@@ -202,6 +202,9 @@ into the log.
 Saving/restoring the VM state
 -----------------------------
 
+Record/replay relies on VM state save and restore being complete and
+deterministic.
+
 All fields in the device state structure (including virtual timers)
 should be restored by loadvm to the same values they had before savevm.