diff --git a/packages/coding-agent/docs/authentication.md b/packages/coding-agent/docs/authentication.md
index 7f7b02b4..aa9a1d07 100644
--- a/packages/coding-agent/docs/authentication.md
+++ b/packages/coding-agent/docs/authentication.md
@@ -108,7 +108,6 @@ Use `/logout` to clear credentials.
 ### OpenAI Codex
 
 - Requires ChatGPT Plus/Pro subscription
-- Prompt cache stored under `~/.pi/agent/cache/openai-codex/`
 - Personal use only; for production, use the OpenAI Platform API
 
 ## Troubleshooting