diff --git a/riocli/jsonschema/schemas/usergroup-schema.yaml b/riocli/jsonschema/schemas/usergroup-schema.yaml
index 8844c05b..85586851 100644
--- a/riocli/jsonschema/schemas/usergroup-schema.yaml
+++ b/riocli/jsonschema/schemas/usergroup-schema.yaml
@@ -28,6 +28,7 @@ definitions:
     properties:
       name:
         type: string
+        pattern: "^[a-zA-Z][a-z A-Z0-9-_]{2,63}$"
       guid:
         $ref: "#/definitions/uuid"
       creator: