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-rw-r--r--qapi/misc.json6
1 files changed, 4 insertions, 2 deletions
diff --git a/qapi/misc.json b/qapi/misc.json
index 7a70eaa3ff..0ab235e41f 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -533,10 +533,12 @@
 #
 # Emitted when the guest changes the RTC time.
 #
-# @offset: offset between base RTC clock (as specified by -rtc base), and
-#          new RTC clock value
+# @offset: offset in seconds between base RTC clock (as specified
+#          by -rtc base), and new RTC clock value
 #
 # Note: This event is rate-limited.
+#       It is not guaranteed that the RTC in the system implements
+#       this event, or even that the system has an RTC at all.
 #
 # Since: 0.13
 #