diff --git a/README.md b/README.md
index 023c883..d562cf3 100644
--- a/README.md
+++ b/README.md
@@ -562,6 +562,7 @@ http.createServer(async (req, res) => {
     - `timezone` (string, optional): Timezone ID (e.g., "America/New_York", "Europe/London", "Asia/Tokyo")
     - `colorScheme` (string, optional): Preferred color scheme
     - `permissions` (array, optional): Permissions to grant (e.g., ["geolocation", "notifications", "camera", "microphone"])
+    - `offline` (boolean, optional): Whether to emulate offline network conditions (equivalent to DevTools offline mode)
   - Read-only: **false**
 
 <!-- NOTE: This has been generated via update-readme.js -->
@@ -756,6 +757,15 @@ http.createServer(async (req, res) => {
 
 <!-- NOTE: This has been generated via update-readme.js -->
 
+- **browser_set_offline**
+  - Title: Set browser offline mode
+  - Description: Toggle browser offline mode on/off (equivalent to DevTools offline checkbox)
+  - Parameters:
+    - `offline` (boolean): Whether to enable offline mode (true) or online mode (false)
+  - Read-only: **false**
+
+<!-- NOTE: This has been generated via update-readme.js -->
+
 - **browser_snapshot**
   - Title: Page snapshot
   - Description: Capture complete accessibility snapshot of the current page. Always returns full snapshot regardless of session snapshot configuration. Better than screenshot for understanding page structure.