Update README.,md

printing/README.md

@@ -43,7 +43,7 @@ for documentation.
    <true/>
    ```
 
-5. If you want to manually set the PdfJs library version for the web, a small script
+5. If you want to manually set the Pdf.js library version for the web, a small script
    has to be added to your `web/index.html` file, just before `</head>`.
    Otherwise it is loaded automatically:
 
@@ -52,6 +52,20 @@ for documentation.
      var dartPdfJsVersion = "3.2.146";
    </script>
    ```
+    5.1. If you want to manually set the alternative location for loading Pdf.js library for the web, the following script has to be added to your `web/index.html` file, just before `</head>`.
+
+    ```html
+    <script>
+      var dartPdfJsBaseUrl = "https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.2.146/";
+    </script>
+   ```
+    It is possible to use local directory which will be resolved to the host where the web app is running.
+
+    ```html
+    <script>
+      var dartPdfJsBaseUrl = "assets/js/pdf/3.2.146/";
+    </script>
+   ```
 
 6. For Windows and Linux, you can force the pdfium version and architecture
    on your main `CMakeLists.txt` with: