diff --git a/doc/jsweet-language-specifications.md b/doc/jsweet-language-specifications.md
index 8ad4f60e..4b540dc1 100644
--- a/doc/jsweet-language-specifications.md
+++ b/doc/jsweet-language-specifications.md
@@ -1634,6 +1634,7 @@ Here, we will step through how to tune the JSweet generation to generate strings
 First, create the `HelloWorldAdapter.java` file in the `jsweet_extension` directory at the root of your project. Copy and paste the following code in that file:
 
 ``` java
+import org.jsweet.transpiler.extension.PrinterAdapter;
 public class HelloWorldAdapter extends PrinterAdapter {
     public HelloWorldAdapter(PrinterAdapter parent) {
         super(parent);
diff --git a/doc/jsweet-language-specifications.pdf b/doc/jsweet-language-specifications.pdf
index 16425774..e20ae76d 100644
Binary files a/doc/jsweet-language-specifications.pdf and b/doc/jsweet-language-specifications.pdf differ
diff --git a/doc/jsweet-language-specifications.tex b/doc/jsweet-language-specifications.tex
index 304c0209..1a45bbc2 100644
--- a/doc/jsweet-language-specifications.tex
+++ b/doc/jsweet-language-specifications.tex
@@ -1648,6 +1648,7 @@ Here, we will step through how to tune the JSweet generation to generate strings
 First, create the \texttt{HelloWorldAdapter.java} file in the \texttt{jsweet\_extension} directory at the root of your project. Copy and paste the following code in that file:
 
 \begin{lstlisting}[language=Java]
+import org.jsweet.transpiler.extension.PrinterAdapter;
 public class HelloWorldAdapter extends PrinterAdapter {
 	public HelloWorldAdapter(PrinterAdapter parent) {
 		super(parent);