diff --git a/docs/PRD.md b/docs/PRD.md
index df0595f3..5549c21a 100644
--- a/docs/PRD.md
+++ b/docs/PRD.md
@@ -70,6 +70,7 @@
 * User
 * API gateway
 * Web-Container
+* Web-DB
 * Proxy&DNS（待定）
 * App&CLI（开发）