diff --git a/README.md b/README.md
index 372a0a4..1b05b99 100644
--- a/README.md
+++ b/README.md
@@ -11,9 +11,12 @@ This plugin allows users to configure the image generation style (realistic, ani
 ## Installation
 
 ```bash
-yarn add @gui-chat-plugin/set-image-style
+yarn add @gui-chat-plugin/set-image-style gui-chat-protocol
 ```
 
+> `gui-chat-protocol` is a peer dependency — install it alongside the plugin; the host application provides the runtime and this plugin only declares the compatible range.
+
+
 ## Usage
 
 ### Vue Implementation (for MulmoChat)