diff --git a/Readme.md b/Readme.md
index 9b058fe..f419427 100644
--- a/Readme.md
+++ b/Readme.md
@@ -42,7 +42,7 @@ Usage of ./bin/kubeconform:
   -output string
         output format - text, json (default "text")
   -registry value
-        filepath template for registry
+        override schemas registry path (can be specified multiple times)
   -skip string
         comma-separated list of kinds to ignore
   -strict
@@ -57,14 +57,14 @@ Usage of ./bin/kubeconform:
 
 * Validating a single, valid file
 ```
-$ ./bin/kubeconform -registry kubernetesjsonschema.dev fixtures/valid.yaml
+$ ./bin/kubeconform fixtures/valid.yaml
 $ echo $?
 0
 ```
 
 * Validating a single invalid file, setting output to json, and printing a summary
 ```
-$ ./bin/kubeconform -registry kubernetesjsonschema.dev -summary -output json fixtures/invalid.yaml
+$ ./bin/kubeconform -summary -output json fixtures/invalid.yaml
 {
   "resources": [
     {
@@ -88,13 +88,35 @@ $ echo $?
 
 * Validating a folder, increasing the number of parallel workers
 ```
-$ ./bin/kubeconform -summary -registry kubernetesjsonschema.dev -n 16 fixtures
+$ ./bin/kubeconform -summary -n 16 fixtures
 fixtures/multi_invalid.yaml - Service is invalid: Invalid type. Expected: integer, given: string
 fixtures/invalid.yaml - ReplicationController is invalid: Invalid type. Expected: [integer,null], given: string
 [...]
 Summary: 48 resources found in 25 files - Valid: 39, Invalid: 2, Errors: 7 Skipped: 0
 ```
 
+### Overriding schemas registries lookup order - CRD support
+
+When the `-registry` file is not used, kubeconform will default to downloading schemas from
+`kubernetesjsonschema.dev`. Kubeconform however supports the use of one, or multiple, custom schemas
+registries - with access over HTTP or local filesystem. Kubeconform will lookup for schema definitions
+in each of them, in order, stopping as soon as a matching file is found.
+
+All 3 following command lines are equivalent:
+```
+$ ./bin/kubeconform fixtures/valid.yaml
+$ ./bin/kubeconform -registry kubernetesjsonschema.dev fixtures/valid.yaml
+$ ./bin/kubeconform -registry 'https://kubernetesjsonschema.dev/{{ .NormalizedVersion }}-standalone{{ .StrictSuffix }}/{{ .ResourceKind }}{{ .KindSuffix }}.json' fixtures/valid.yaml
+```
+
+To support validating CRDs, we need to convert OpenAPI files to JSON schema, storing the JSON schemas
+in a local folder - for example schemas. Then we specify this folder as an additional registry to lookup:
+
+```
+# If the resource Kind is not found in kubernetesjsonschema.dev, also lookup in the schemas/ folder for a matching file
+$ ./bin/kubeconform -registry kubernetesjsonschema.dev -registry 'schemas/{{ .ResourceKind }}{{ .KindSuffix }}.json' fixtures/custom-resource.yaml
+```
+
 ### Credits
 
  * @garethr for the [Kubeval](https://github.com/instrumenta/kubeval) and
diff --git a/acceptance.bats b/acceptance.bats
index 2d3f2cf..adec878 100755
--- a/acceptance.bats
+++ b/acceptance.bats
@@ -1,63 +1,63 @@
 #!/usr/bin/env bats
 
 @test "Pass when parsing a valid Kubernetes config YAML file" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -summary fixtures/valid.yaml
+  run bin/kubeconform -summary fixtures/valid.yaml
   [ "$status" -eq 0 ]
   [ "$output" = "Summary: 1 resource found in 1 file - Valid: 1, Invalid: 0, Errors: 0 Skipped: 0" ]
 }
 
 @test "Pass when parsing a folder containing valid YAML files" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -summary fixtures/folder
+  run bin/kubeconform -summary fixtures/folder
   [ "$status" -eq 0 ]
   [ "$output" = "Summary: 7 resources found in 2 files - Valid: 7, Invalid: 0, Errors: 0 Skipped: 0" ]
 }
 
 @test "Pass when parsing a Kubernetes file with string and integer quantities" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -verbose fixtures/quantity.yaml
+  run bin/kubeconform -verbose fixtures/quantity.yaml
   [ "$status" -eq 0 ]
   [ "$output" = "fixtures/quantity.yaml - LimitRange is valid" ]
 }
 
 @test "Pass when parsing a valid Kubernetes config file with null arrays" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -verbose fixtures/null_string.yaml
+  run bin/kubeconform -verbose fixtures/null_string.yaml
   [ "$status" -eq 0 ]
   [ "$output" = "fixtures/null_string.yaml - Service is valid" ]
 }
 
 @test "Pass when parsing a multi-document config file" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -summary fixtures/multi_valid.yaml
+  run bin/kubeconform -summary fixtures/multi_valid.yaml
   [ "$status" -eq 0 ]
   [ "$output" = "Summary: 6 resources found in 1 file - Valid: 6, Invalid: 0, Errors: 0 Skipped: 0" ]
 }
 
 @test "Fail when parsing a multi-document config file with one invalid resource" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev fixtures/multi_invalid.yaml
+  run bin/kubeconform fixtures/multi_invalid.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Fail when parsing an invalid Kubernetes config file" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev fixtures/invalid.yaml
+  run bin/kubeconform fixtures/invalid.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Return relevant error for non-existent file" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev fixtures/not-here
+  run bin/kubeconform fixtures/not-here
   [ "$status" -eq 1 ]
   [ "$output" = "fixtures/not-here -  failed validation: open fixtures/not-here: no such file or directory" ]
 }
 
 @test "Fail when parsing a config with additional properties and strict set" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -strict -k8sversion 1.16.0 fixtures/extra_property.yaml
+  run bin/kubeconform -strict -k8sversion 1.16.0 fixtures/extra_property.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Fail when parsing a config with CRD" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev fixtures/test_crd.yaml
+  run bin/kubeconform fixtures/test_crd.yaml
   [ "$status" -eq 1 ]
 }
 
 @test "Pass when parsing a config with CRD and ignoring missing schemas" {
-  run bin/kubeconform -registry kubernetesjsonschema.dev -ignore-missing-schemas fixtures/test_crd.yaml
+  run bin/kubeconform -ignore-missing-schemas fixtures/test_crd.yaml
   [ "$status" -eq 0 ]
 }
 
diff --git a/cmd/kubeconform/main.go b/cmd/kubeconform/main.go
index 0860223..a9e2a7a 100644
--- a/cmd/kubeconform/main.go
+++ b/cmd/kubeconform/main.go
@@ -217,7 +217,7 @@ func realMain() int {
 	var files []string
 
 	flag.StringVar(&k8sVersion, "k8sversion", "1.18.0", "version of Kubernetes to test against")
-	flag.Var(&regs, "registry", "filepath template for registry")
+	flag.Var(&regs, "registry", "override schemas registry path (can be specified multiple times)")
 	flag.BoolVar(&ignoreMissingSchemas, "ignore-missing-schemas", false, "skip files with missing schemas instead of failing")
 	flag.BoolVar(&summary, "summary", false, "print a summary at the end")
 	flag.IntVar(&nWorkers, "n", 4, "number of routines to run in parallel")
@@ -240,8 +240,7 @@ func realMain() int {
 
 	registries := []registry.Registry{}
 	if len(regs) == 0 {
-		fmt.Println("At least one registry needs to be set - add -registry kubernetesjsonschema.dev ?")
-		return 1
+		regs = append(regs, "kubernetesjsonschema.dev") // if not specified, default behaviour is to use kubernetesjson-schema.dev as registry
 	}
 
 	for _, reg := range regs {