diff --git a/README.md b/README.md
index 3b17fe2..1c4454f 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,8 @@ cp deploy/opencode/iai-mcp-capture.js ~/.config/opencode/plugins/
 cp deploy/opencode/iai-mcp-session-init.js ~/.config/opencode/plugins/
 ```
 
+Note: a brief "INIT" message will appear in chat on the first turn. This is the mechanism that delivers the system instruction to the model.
+
 Make sure `@opencode-ai/plugin` is installed:
 
 ```bash