diff --git a/INSTALL.md b/INSTALL.md
index d02980335..1d9ec5cde 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -289,7 +289,8 @@ docker push codiumai/pr-agent:github_app  # Push to your Docker repository
     ```
 4. Create a lambda function that uses the uploaded image. Set the lambda timeout to be at least 3m.
 5. Configure the lambda function to have a Function URL.
-6. Go back to steps 8-9 of [Method 5](#run-as-a-github-app) with the function url as your Webhook URL.
+6. In the environment variables of the Lambda function, specify `AZURE_DEVOPS_CACHE_DIR` to a writable location such as /tmp. (see [#443](https://github.com/Codium-ai/pr-agent/issues/443))
+7. Go back to steps 8-9 of [Method 5](#run-as-a-github-app) with the function url as your Webhook URL.
     The Webhook URL would look like `https://<LAMBDA_FUNCTION_URL>/api/v1/github_webhooks`
 
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