diff --git a/README.md b/README.md
index 9906df0..42e7a1c 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,8 @@ There is no separate `etaf-data` install: Data is a core ETAF capability. There
 
 ## Load and verify
 
+ECSS 0.1.0 and TP 1.0.0 are independent packages and may be installed in either order. Install both before Ebox 2.0.0, then install ETAF. ETAF consumes only the Ebox 2.0 public rendering contract.
+
 During development, load the sibling Ebox checkout before ETAF:
 
 ```elisp
diff --git a/README.zh-CN.md b/README.zh-CN.md
index e8be057..3617b68 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -70,6 +70,8 @@ Component(props, Scope) → View → Renderer → Ebox Node → Emacs buffer
 
 ## 加载与验证
 
+ECSS 0.1.0 与 TP 1.0.0 是互相独立的包，安装顺序任意；两者都安装后再安装 Ebox 2.0.0，最后安装 ETAF。ETAF 只使用 Ebox 2.0 的公共渲染契约。
+
 开发时先把同级 Ebox 检出目录加入 `load-path`：
 
 ```elisp
diff --git a/etaf.el b/etaf.el
index c85eb8c..f14223b 100644
--- a/etaf.el
+++ b/etaf.el
@@ -4,7 +4,7 @@
 
 ;; Author: ETAF contributors
 ;; Version: 0.1.0
-;; Package-Requires: ((emacs "29.1") (ebox "1.0.1"))
+;; Package-Requires: ((emacs "29.1") (ebox "2.0.0"))
 ;; Keywords: ui, tools, convenience
 ;; URL: https://github.com/ginqi7/etaf