Fix readme

@@ -141,6 +141,23 @@ and refresh.
 
 
 Take a look at the [example tab](example) for a sample project.
 Take a look at the [example tab](example) for a sample project.
 
 
+Update the `_generatePdf` method with your design.
+
+```dart
+Future<Uint8List> _generatePdf(PdfPageFormat format, String title) async {
+    final pdf = pw.Document();
+
+    pdf.addPage(
+      pw.Page(
+        pageFormat: format,
+        build: (context) => pw.Placeholder(),
+      ),
+    );
+
+    return pdf.save();
+  }
+```
+
 This widget also features a debug switch at the bottom right to display the
 This widget also features a debug switch at the bottom right to display the
 drawing constraints used. This switch is available only on debug builds.
 drawing constraints used. This switch is available only on debug builds.
 
 
@@ -148,6 +165,7 @@ Moving on to your production application, you can keep only the `_generatePdf`
 function and print the document using:
 function and print the document using:
 
 
 ```dart
 ```dart
+final title = 'Flutter Demo';
 await Printing.layoutPdf(onLayout: (format) => _generatePdf(format, title));
 await Printing.layoutPdf(onLayout: (format) => _generatePdf(format, title));
 ```
 ```
 
 

@@ -49,13 +49,12 @@ void buildFile(String src, String dest, bool flutter) {
   final output = File(dest);
   final output = File(dest);
   final st = output.openWrite();
   final st = output.openWrite();
   st.writeln('import \'dart:io\';');
   st.writeln('import \'dart:io\';');
+  st.writeln('import \'dart:typed_data\';');
   if (flutter) {
   if (flutter) {
     st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
     st.writeln('import \'package:flutter/services.dart\' show rootBundle;');
     st.writeln('import \'package:flutter/widgets.dart\' show AssetImage;');
     st.writeln('import \'package:flutter/widgets.dart\' show AssetImage;');
     st.writeln('import \'package:path_provider/path_provider.dart\';');
     st.writeln('import \'package:path_provider/path_provider.dart\';');
     st.writeln('import \'package:printing/printing.dart\';');
     st.writeln('import \'package:printing/printing.dart\';');
-  } else {
-    st.writeln('import \'dart:typed_data\';');
   }
   }
   st.writeln('import \'package:pdf/pdf.dart\';');
   st.writeln('import \'package:pdf/pdf.dart\';');
   st.writeln('import \'package:pdf/widgets.dart\' as pw;');
   st.writeln('import \'package:pdf/widgets.dart\' as pw;');