diff --git a/qapi/misc.json b/qapi/misc.json
index 6bd11f50e6..33b94e3589 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -1020,6 +1020,12 @@
 #
 # @cpu-index: The CPU to use for commands that require an implicit CPU
 #
+# Features:
+# @savevm-monitor-nodes: If present, HMP command savevm only snapshots
+#                        monitor-owned nodes if they have no parents.
+#                        This allows the use of 'savevm' with
+#                        -blockdev. (since 4.2)
+#
 # Returns: the output of the command as a string
 #
 # Since: 0.14.0
@@ -1047,7 +1053,8 @@
 ##
 { 'command': 'human-monitor-command',
   'data': {'command-line': 'str', '*cpu-index': 'int'},
-  'returns': 'str' }
+  'returns': 'str',
+  'features': [ 'savevm-monitor-nodes' ] }
 
 ##
 # @change: