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-rw-r--r--qga/qapi-schema.json11
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diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 2af3515..7155b7a 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -2,6 +2,17 @@
##
#
+# General note concerning the use of guest agent interfaces:
+#
+# "unsupported" is a higher-level error than the errors that individual
+# commands might document. The caller should always be prepared to receive
+# QERR_UNSUPPORTED, even if the given command doesn't specify it, or doesn't
+# document any failure mode at all.
+#
+##
+
+##
+#
# Echo back a unique integer value, and prepend to response a
# leading sentinel byte (0xFF) the client can check scan for.
#