diff --git a/config/config.yaml b/config/config.yaml
index fbd9aa81e..1063babbe 100644
--- a/config/config.yaml
+++ b/config/config.yaml
@@ -5,6 +5,7 @@
 
 #OPENAI_API_KEY: "YOUR_API_KEY"
 #OPENAI_API_BASE: "YOUR_API_BASE"
+#OPENAI_PROXY: "http://127.0.0.1:8118"
 OPENAI_API_MODEL: "gpt-4"
 MAX_TOKENS: 1500
 RPM: 10
@@ -31,6 +32,17 @@ RPM: 10
 ## Visit https://serper.dev/ to get key.
 #SERPER_API_KEY: "YOUR_API_KEY"
 
+#### for web access
+
+## Supported values: playwright/selenium
+#WEB_BROWSER_ENGINE: playwright
+
+## Supported values: chromium/firefox/webkit, visit https://playwright.dev/python/docs/api/class-browsertype
+##PLAYWRIGHT_BROWSER_TYPE: chromium
+
+## Supported values: chrome/firefox/edge/ie, visit https://www.selenium.dev/documentation/webdriver/browsers/
+# SELENIUM_BROWSER_TYPE: chrome
+
 #### for TTS
 
 #AZURE_TTS_SUBSCRIPTION_KEY: "YOUR_API_KEY"
diff --git a/metagpt/config.py b/metagpt/config.py
index 8d8725776..bc78d44ba 100644
--- a/metagpt/config.py
+++ b/metagpt/config.py
@@ -65,9 +65,9 @@ class Config(metaclass=Singleton):
         self.google_api_key = self._get("GOOGLE_API_KEY")
         self.google_cse_id = self._get("GOOGLE_CSE_ID")
         self.search_engine = self._get("SEARCH_ENGINE", SearchEngineType.SERPAPI_GOOGLE)
-        self.web_browser_engine = self._get("WEB_BROWSER_ENGINE", WebBrowserEngineType.PLAYWRIGHT)
+        self.web_browser_engine = WebBrowserEngineType(self._get("WEB_BROWSER_ENGINE", "playwright"))
         self.playwright_browser_type = self._get("PLAYWRIGHT_BROWSER_TYPE", "chromium")
-        self.selenium_browser_type = self._get("selenium_browser_type", "chrome")
+        self.selenium_browser_type = self._get("SELENIUM_BROWSER_TYPE", "chrome")
         self.max_budget = self._get("MAX_BUDGET", 10.0)
         self.total_cost = 0.0