diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6f0077..52b1b8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
+## [Unreleased]
+
+### Added
+- Non-blocking tab navigation: switching tabs within the extension popup no longer aborts ongoing translation or chat tasks, allowing concurrent executions to complete in the background.
+
 ## [3.6.0] - 2026-06-29
 
 ### Changed
diff --git a/README.md b/README.md
index d0ae230..3a74904 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@
 
 ## Features
 
+- **Background Execution**: Translation, polishing, dictionary, and chat requests run in a background service worker. Switching tabs or closing the popup will not interrupt active operations, and finished results are automatically saved to your history.
 - **Translation**: Translate between Chinese, English, Japanese, and Korean. Auto-detects source language.
 - **Text Polishing**: Polish text and explain changes in Chinese.
 - **Dictionary**: Definitions, parts of speech, root/affix analysis, and bilingual example sentences.