diff --git a/source/_posts/nf-java9.md b/source/_posts/nf-java9.md
index cc4300a..b027bfb 100644
--- a/source/_posts/nf-java9.md
+++ b/source/_posts/nf-java9.md
@@ -3,6 +3,7 @@ title: Java 9的新特性
 tags:
   - JVM
   - Java
+  - Java 9
   - Optional
   - JPMS
   - 新特性