diff --git a/docs/developer.md b/docs/developer.md
index 26fb0bb2b..f8351e28a 100644
--- a/docs/developer.md
+++ b/docs/developer.md
@@ -284,6 +284,7 @@ manifest files:
 
 Postgres manifest parameters are defined in the [api package](../pkg/apis/acid.zalan.do/v1/postgresql_type.go).
 The operator behavior has to be implemented at least in [k8sres.go](../pkg/cluster/k8sres.go).
+Validation of CRD parameters is controlled in [crd.go](../pkg/apis/acid.zalan.do/v1/crds.go).
 Please, reflect your changes in tests, for example in:
 * [config_test.go](../pkg/util/config/config_test.go)
 * [k8sres_test.go](../pkg/cluster/k8sres_test.go)
@@ -294,6 +295,7 @@ Please, reflect your changes in tests, for example in:
 For the CRD-based configuration, please update the following files:
 * the default [OperatorConfiguration](../manifests/postgresql-operator-default-configuration.yaml)
 * the Helm chart's [values-crd file](../charts/postgres-operator/values.yaml)
+* the CRD's [validation](../manifests/operatorconfiguration.crd.yaml)
 
 Reflect the changes in the ConfigMap configuration as well (note that numeric
 and boolean parameters have to use double quotes here):
diff --git a/pkg/apis/acid.zalan.do/v1/crds.go b/pkg/apis/acid.zalan.do/v1/crds.go
index 8fd820fe8..0b18319d8 100644
--- a/pkg/apis/acid.zalan.do/v1/crds.go
+++ b/pkg/apis/acid.zalan.do/v1/crds.go
@@ -107,7 +107,8 @@ var min0 = 0.0
 var min1 = 1.0
 var minDisable = -1.0
 
-var postgresCRDResourceValidation = apiextv1beta1.JSONSchemaProps{
+// PostgresCRDResourceValidation to check applied manifest parameters
+var PostgresCRDResourceValidation = apiextv1beta1.JSONSchemaProps{
 	Type:     "object",
 	Required: []string{"spec"},
 	Properties: map[string]apiextv1beta1.JSONSchemaProps{
@@ -520,7 +521,8 @@ var postgresCRDResourceValidation = apiextv1beta1.JSONSchemaProps{
 	},
 }
 
-var operatorConfigCRDResourceValidation = apiextv1beta1.JSONSchemaProps{
+// OperatorConfigCRDResourceValidation to check applied manifest parameters
+var OperatorConfigCRDResourceValidation = apiextv1beta1.JSONSchemaProps{
 	Type:     "object",
 	Required: []string{"configuration"},
 	Properties: map[string]apiextv1beta1.JSONSchemaProps{
@@ -920,7 +922,7 @@ func PostgresCRD() *apiextv1beta1.CustomResourceDefinition {
 		PostgresCRDResourcePlural,
 		PostgresCRDResourceShort,
 		PostgresCRDResourceColumns,
-		postgresCRDResourceValidation)
+		PostgresCRDResourceValidation)
 }
 
 // ConfigurationCRD returns CustomResourceDefinition built from OperatorConfigCRDResource
@@ -930,5 +932,5 @@ func ConfigurationCRD() *apiextv1beta1.CustomResourceDefinition {
 		OperatorConfigCRDResourcePlural,
 		OperatorConfigCRDResourceShort,
 		OperatorConfigCRDResourceColumns,
-		operatorConfigCRDResourceValidation)
+		OperatorConfigCRDResourceValidation)
 }