diff --git a/manifests/postgresql.crd.yaml b/manifests/postgresql.crd.yaml
index 23921934a..1a3edabfc 100644
--- a/manifests/postgresql.crd.yaml
+++ b/manifests/postgresql.crd.yaml
@@ -587,7 +587,17 @@ spec:
                 nullable: true
                 items:
                   type: object
-                  x-kubernetes-preserve-unknown-fields: true
+                  properties:
+                    maxSkew:
+                      type: integer
+                      format: int32
+                    topologyKey:
+                      type: string
+                    whenUnsatisfiable:
+                      type: string
+                      enum:
+                        - DoNotSchedule
+                        - ScheduleAnyway
               useLoadBalancer:
                 type: boolean
                 description: deprecated
diff --git a/pkg/apis/acid.zalan.do/v1/crds.go b/pkg/apis/acid.zalan.do/v1/crds.go
index 062db9ba7..b77bba1fd 100644
--- a/pkg/apis/acid.zalan.do/v1/crds.go
+++ b/pkg/apis/acid.zalan.do/v1/crds.go
@@ -111,6 +111,7 @@ var OperatorConfigCRDResourceColumns = []apiextv1.CustomResourceColumnDefinition
 
 var min0 = 0.0
 var min1 = 1.0
+var minLength1 int64 = 1
 var minDisable = -1.0
 
 // PostgresCRDResourceValidation to check applied manifest parameters
@@ -900,8 +901,26 @@ var PostgresCRDResourceValidation = apiextv1.CustomResourceValidation{
 						Nullable: true,
 						Items: &apiextv1.JSONSchemaPropsOrArray{
 							Schema: &apiextv1.JSONSchemaProps{
-								Type:                   "object",
-								XPreserveUnknownFields: util.True(),
+								Type: "object",
+								Properties: map[string]apiextv1.JSONSchemaProps{
+									"maxSkew": {
+										Type:    "integer",
+										Format:  "int32",
+										Minimum: &min1,
+									},
+									"topologyKey": {
+										Type:      "string",
+										MinLength: &minLength1,
+									},
+									"whenUnsatisfiable": {
+										Type: "string",
+										Enum: []apiextv1.JSON{
+											{Raw: []byte(`"DoNotSchedule"`)},
+											{Raw: []byte(`"ScheduleAnyway"`)},
+										},
+									},
+								},
+								Required: []string{"maxSkew", "topologyKey", "whenUnsatisfiable"},
 							},
 						},
 					},