diff --git a/graph/defs/README.md b/graph/defs/README.md
index 000ac2a..6efad1e 100644
--- a/graph/defs/README.md
+++ b/graph/defs/README.md
@@ -5,5 +5,7 @@
 ## 錯誤碼
 
 - `NOT_FOUND`：找不到指定的實體。
-- `UNAUTHORIZED`：這個 API 需要認證或授權後才能運作。如果權限 (scope) 不足也會顯示這個錯誤。
-- `USER_VERIFIED`：使用者已經驗證過，不用重複驗證。目前只用於 `verifyRegistration` mutation。
+- `UNAUTHORIZED`：這個 API 需要認證或授權後才能運作。
+- `NOT_IMPLEMENTED`：這個 API 尚未實作，請先不要呼叫。
+- `FORBIDDEN`：使用者的權限 (scope) 不足以執行這個操作。
+- `INVALID_INPUT`：輸入有誤。
diff --git a/graph/defs/errors.go b/graph/defs/errors.go
index 15d89c1..8c9696a 100644
--- a/graph/defs/errors.go
+++ b/graph/defs/errors.go
@@ -40,12 +40,6 @@ var ErrForbidden = GqlError{
 	Code:    CodeForbidden,
 }
 
-// ErrVerified is the error for "user already verified".
-var ErrVerified = GqlError{
-	Message: "user already verified",
-	Code:    CodeUserVerified,
-}
-
 // ErrNotImplemented is the error for "not implemented".
 var ErrNotImplemented = GqlError{
 	Message: "not implemented",
@@ -67,8 +61,6 @@ const (
 	CodeNotFound = "NOT_FOUND"
 	// CodeUnauthorized is the error code for "require authentication".
 	CodeUnauthorized = "UNAUTHORIZED"
-	// CodeUserVerified is the error code for "user already verified".
-	CodeUserVerified = "USER_VERIFIED"
 	// CodeNotImplemented is the error code for "not implemented".
 	CodeNotImplemented = "NOT_IMPLEMENTED"
 	// CodeForbidden is the error code for "forbidden".