diff --git a/memento-note/app/api/ai/transform-markdown/route.ts b/memento-note/app/api/ai/transform-markdown/route.ts
index bc1caee..77f81b6 100644
--- a/memento-note/app/api/ai/transform-markdown/route.ts
+++ b/memento-note/app/api/ai/transform-markdown/route.ts
@@ -22,14 +22,14 @@ export async function POST(request: NextRequest) {
     const wordCount = text.split(/\s+/).length
     if (wordCount < 10) {
       return NextResponse.json(
-        { error: 'Text must have at least 10 words to transform' },
+        { errorKey: 'ai.wordCountMin', params: { min: 10, current: wordCount } },
         { status: 400 }
       )
     }
 
-    if (wordCount > 500) {
+    if (wordCount > 2000) {
       return NextResponse.json(
-        { error: 'Text must have maximum 500 words to transform' },
+        { errorKey: 'ai.wordCountMax', params: { max: 2000, current: wordCount } },
         { status: 400 }
       )
     }