Fix a config issue.
diff --git a/data/docs.yml b/data/docs.yml
index 35f0c77..0f59a07 100644
--- a/data/docs.yml
+++ b/data/docs.yml
@@ -29,7 +29,7 @@
   description:
   list:
     - name: Nginx LUA Agent
-      icon: N
+      icon: L
       description: SkyWalking Nginx Agent provides the native tracing capability for Nginx powered by Nginx LUA module.
       user: apache
       repo: skywalking-nginx-lua