diff --git a/readme.md b/readme.md
index f8a8fd5..2cc3866 100644
--- a/readme.md
+++ b/readme.md
@@ -6,17 +6,9 @@ Also check [its tweet thread](https://twitter.com/ShunyuYao12/status/16593575474
 
 
 ## Setup
-You need to first have an OpenAI API key and store it in the environment variable ``OPENAI_API_KEY`` (see [here](https://help.openai.com/en/articles/5112595-best-practices-for-api-key-safety)).
+You need to first have an OpenAI API key and store it in the environment variable ``OPENAI_API_KEY`` (see [here](https://help.openai.com/en/articles/5112595-best-practices-for-api-key-safety)). If you use custom base url, set it by environment variable ``OPENAI_API_BASE`` (e.g. https://api.openai.com/v1).
 
-If you use custom base url, set it by environment variable ``OPENAI_API_BASE`` (e.g. "https://api.openai.com/v1").
-
-(Note GPT-4 model is farily slow, please be patient.)
-
-Package requirement: ``openai``, ``backoff``, ``sympy``, ``numpy``. 
-
-```
-pip install openai backoff sympy numpy
-```
+Package requirement: ``pip install openai backoff sympy numpy``
 
 
 ## Experiments