diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index 426ce4ee82..d8dbda4b50 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -244,19 +244,18 @@
 #
 # @model: the expanded CpuModelInfo.
 #
-# @deprecated-props: a list of properties that are flagged as
+# @deprecated-props: an optional list of properties that are flagged as
 #     deprecated by the CPU vendor.  The list depends on the
 #     CpuModelExpansionType: "static" properties are a subset of the
 #     enabled-properties for the expanded model; "full" properties are
 #     a set of properties that are deprecated across all models for
-#     the architecture.  (since: 9.1).
+#     the architecture.  (since: 10.1 -- since 9.1 on s390x --).
 #
 # Since: 2.8
 ##
 { 'struct': 'CpuModelExpansionInfo',
   'data': { 'model': 'CpuModelInfo',
-            'deprecated-props' : { 'type': ['str'],
-                                   'if': 'TARGET_S390X' } },
+            '*deprecated-props' : ['str'] },
   'if': { 'any': [ 'TARGET_S390X',
                    'TARGET_I386',
                    'TARGET_ARM',