1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4a489c0..08a806e 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@
       - JSON `{"name":"NAME", "id": "ID"}`
     - 400 Bad Request
       - JSON `"UID is taken"`
+      - JSON `"Invalid Username"`
     - 500 Internal Server Error
       - JSON `"No available UID left"`
       - JSON `"UID length is incorrect"`