diff --git a/Readme.md b/Readme.md
index 75d8655..aadf9ee 100644
--- a/Readme.md
+++ b/Readme.md
@@ -183,6 +183,8 @@ $ ./scripts/openapi2jsonschema.py https://raw.githubusercontent.com/aws/amazon-s
 JSON schema written to trainingjob_v1.json
 ```
 
+The `FILENAME_FORMAT` environment variable can be used to change the output file name (Available variables: `kind`, `group`, `version`) (Default: `{kind}_{version}`).
+
 ### Speed comparison with Kubeval
 
 Running on a pretty large kubeconfigs setup, on a laptop with 4 cores:
diff --git a/scripts/openapi2jsonschema.py b/scripts/openapi2jsonschema.py
index f80abfa..52a0c80 100755
--- a/scripts/openapi2jsonschema.py
+++ b/scripts/openapi2jsonschema.py
@@ -88,6 +88,21 @@ def append_no_duplicates(obj, key, value):
         obj[key].append(value)
 
 
+def write_schema_file(schema, filename):
+    schemaJSON = ""
+
+    schema = additional_properties(schema)
+    schema = replace_int_or_string(schema)
+    schemaJSON = json.dumps(schema)
+
+    # Dealing with user input here..
+    filename = os.path.basename(filename)
+    f = open(filename, "w")
+    f.write(schemaJSON)
+    f.close()
+    print("JSON schema written to {filename}".format(filename=filename))
+
+
 if len(sys.argv) == 0:
     print("missing file")
     exit(1)
@@ -104,30 +119,27 @@ for crdFile in sys.argv[1:]:
             if y["kind"] != "CustomResourceDefinition":
                 continue
 
+            filename_format = os.getenv("FILENAME_FORMAT", "{kind}_{version}")
             filename = ""
-            schemaJSON = ""
             if "spec" in y and "validation" in y["spec"] and "openAPIV3Schema" in y["spec"]["validation"]:
-                filename = y["spec"]["names"]["kind"].lower()+"_"+y["spec"]["version"].lower()+".json"
+                filename = filename_format.format(
+                    kind=y["spec"]["names"]["kind"],
+                    group=y["spec"]["group"].split(".")[0],
+                    version=y["spec"]["version"],
+                ).lower() + ".json"
 
                 schema = y["spec"]["validation"]["openAPIV3Schema"]
-                schema = additional_properties(schema)
-                schema = replace_int_or_string(schema)
-                schemaJSON = json.dumps(schema)
+                write_schema_file(schema, filename)
             elif "spec" in y and "versions" in y["spec"]:
                 for version in y["spec"]["versions"]:
                     if "schema" in version and "openAPIV3Schema" in version["schema"]:
-                        filename = y["spec"]["names"]["kind"].lower()+"_"+version["name"].lower()+".json"
+                        filename = filename_format.format(
+                            kind=y["spec"]["names"]["kind"],
+                            group=y["spec"]["group"].split(".")[0],
+                            version=version["name"],
+                        ).lower() + ".json"
 
                         schema = version["schema"]["openAPIV3Schema"]
-                        schema = additional_properties(schema)
-                        schema = replace_int_or_string(schema)
-                        schemaJSON = json.dumps(schema)
-
-            # Dealing with user input here..
-            filename = os.path.basename(filename)
-            f = open(filename, "w")
-            f.write(schemaJSON)
-            f.close()
-            print("JSON schema written to {filename}".format(filename=filename))
+                        write_schema_file(schema, filename)
 
 exit(0)