diff --git a/src/main/java/qp/official/qp/web/dto/AnswerRequestDTO.java b/src/main/java/qp/official/qp/web/dto/AnswerRequestDTO.java
index 04a51bbf..e58d6a0f 100644
--- a/src/main/java/qp/official/qp/web/dto/AnswerRequestDTO.java
+++ b/src/main/java/qp/official/qp/web/dto/AnswerRequestDTO.java
@@ -18,7 +18,7 @@ public static class AnswerCreateDTO {
         String title;
         @NotBlank
         String content;
-        @NotBlank
+        @NotNull(message = "카테고리는 'PARENT', 'CHILD' 중 하나여야 합니다.")
         Category category;
         Long answerGroup;
     }