diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6bf7b21..33a62ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change History
 
+## 2.8.1
+
+- fix empty service worker files #102
+
 ## 2.8.0
 
 - Add \.ico as a supported PWA icon format #78
diff --git a/docs/http.md b/docs/http.md
index bfde892..346237f 100644
--- a/docs/http.md
+++ b/docs/http.md
@@ -15,10 +15,27 @@ If yes, when the client sends Save-Data headers, optimizations are enforced rega
 
 ### HTTP Server Timing
 
-Send HTTP Server Timing headers. They can be viewed in the google chrome network panel. Click on the network panel -> Click on your web page -> Click on the timing tab on the right. It should be turned off on production.
-ps: this helped me spot a [regression in the image processing](https://github.com/tbela99/gzip/issues/38) that has since been fixed
+Use the global Joomla profiler to profile you code
 
-![Server Timing](./images/Server-Timing.PNG)
+```php
+# sample code
+    $profiler = JProfiler::getInstance('Application');
+
+    // profile sections of your code    
+    $profiler->mark('afterParseImages');
+    $body = Gzip\GZipHelper::parseCss($body, $options);
+
+    $profiler->mark('afterParseCss');
+    $body = Gzip\GZipHelper::parseScripts($body, $options);
+    
+    $profiler->mark('afterParseScripts');
+    $body = Gzip\GZipHelper::parseURLs($body, $options);
+
+    $profiler->mark('afterParseURLs');    
+```
+Open the google chrome console and navigate to the network tab. Click on your page request. Click the timing tab. You will see the result.
+
+![Server Timing](./img/Server-Timing.PNG)
 
 ### DNS Prefetch
 
diff --git a/docs/web-share-target.md b/docs/web-share-target.md
index c874bff..96b3489 100644
--- a/docs/web-share-target.md
+++ b/docs/web-share-target.md
@@ -1,6 +1,6 @@
 # Web Share Target
 
-Web Share Target Level 2 is the web standard that allow your app to receive data shared by other apps.
+Web Share Target Level 2 is the web standard that allow your pwa app to receive data shared by other apps on android/ios platforms.
 
 ![Web Share Target](./img/web-share-target.jpg)
 
diff --git a/gzip.xml b/gzip.xml
index 5ce0183..33910bf 100644
--- a/gzip.xml
+++ b/gzip.xml
@@ -7,7 +7,7 @@
     <license>Released under dual license LGPL v3 | MIT</license>
     <authorEmail>contact@tbela.net</authorEmail>
     <authorUrl>https://tbela.net</authorUrl>
-    <version>2.8.0</version>
+    <version>2.8.1</version>
     <description>PLG_SYSTEM_GZIP_XML_DESCRIPTION</description>
     <files>
         <folder>docs</folder>
diff --git a/package.json b/package.json
index 4f16a6a..21fd7b7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gzip",
-  "version": "2.8.0",
+  "version": "2.8.1",
   "scripts": {
     "build": "./build.sh",
     "rollup-config": "./node_modules/rollup/dist/bin/rollup ./config/rollup/rollup.js -f iife --name=rollupConfig > ./rollup.config.js",
diff --git a/worker_version b/worker_version
index be0e2cd..e6ca913 100644
--- a/worker_version
+++ b/worker_version
@@ -1 +1 @@
-da39a3ee5e6b4b0d3255bfef95601890afd80709
+e7ad24017b85c6eae7d16c9cbf4a6f1f8f19eee3