diff --git a/.github/workflows/asciidoc.sh b/.github/workflows/asciidoc.sh
index 766695e..0d2c72f 100755
--- a/.github/workflows/asciidoc.sh
+++ b/.github/workflows/asciidoc.sh
@@ -13,10 +13,10 @@ cp "${ASCIIDOCTOR_PDF_DIR}/data/themes/default-theme.yml" ${CURRENT_PATH}/themes
 cp -r -f "${ASCIIDOCTOR_PDF_DIR}/data/fonts/" ${CURRENT_PATH}/
 
 echo "Rendering HTML5..."
-asciidoctor -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/html/ -o index.html  -a ci=ci -a imagesdir="images"  -r asciidoctor-diagram   index.adoc
+asciidoctor -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/html/ -o index.html -a ci=ci -a imagesdir="images" -a lang=fr -r asciidoctor-diagram index.adoc
 
 echo "Rendering PDF..."
-asciidoctor-pdf -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/pdf/ -o index.pdf -a ci=ci -a imagesdir="${CURRENT_PATH}/images"  -a scripts@=cjk  -a pdf-styledir=${CURRENT_PATH}/themes -a pdf-fontsdir=${CURRENT_PATH}/fonts -r asciidoctor-diagram  index.adoc
+asciidoctor-pdf -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/pdf/ -o index.pdf -a ci=ci -a imagesdir="${CURRENT_PATH}/images" -a lang=fr -a scripts@=cjk -a pdf-styledir=${CURRENT_PATH}/themes -a pdf-fontsdir=${CURRENT_PATH}/fonts -r asciidoctor-diagram index.adoc
 
 echo "Rendering EPUB..."
-asciidoctor-epub3 -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/epub/ -o index.epub  -r asciidoctor-diagram -a ci=ci -a imagesdir="${CURRENT_PATH}/images"   index.adoc
+asciidoctor-epub3 -B ${CURRENT_PATH}/ -D ${CURRENT_PATH}/outputs/epub/ -o index.epub -r asciidoctor-diagram -a ci=ci -a imagesdir="${CURRENT_PATH}/images" -a lang=fr index.adoc
diff --git a/.github/workflows/render.yml b/.github/workflows/render.yml
index 5ee6705..ea4512f 100644
--- a/.github/workflows/render.yml
+++ b/.github/workflows/render.yml
@@ -14,6 +14,9 @@ jobs:
       uses: Analog-inc/asciidoctor-action@v1.2.1
       with:
         shellcommand: "./.github/workflows/asciidoc.sh"
+    - name: Copy images for HTML output
+      run: |
+        sudo cp -rv images outputs/html
     - name: Extract branch name
       shell: bash
       run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
diff --git a/chapters/chapter-1.adoc b/chapters/chapter-1.adoc
index e4ce63f..ff067bb 100644
--- a/chapters/chapter-1.adoc
+++ b/chapters/chapter-1.adoc
@@ -219,9 +219,31 @@ if (a instanceof ArrayList) {
     // ... // <1>
 }
 ----
-
 <1> l’execution entrera dans le bloc si l’objet pointé par la variable `a` est de type `ArrayList` ou d’un sous-type d’ `ArrayList`
 
+Classiquement, tester le type d'une variable est suivi par un *cast* :
+
+[source,java]
+----
+void callBarkIfPossible(Animal animal) {
+    if (animal instanceof Dog) {
+        Dog dog = (Dog) animal; // <1>
+        dog.bark();
+    }
+}
+----
+<1> Ce type de *cast* est appelé *downcasting* (passage d'un type parent à un type enfant)
+
+A partir de Java 16 l'opérateur `instanceof` peut prendre une opérande supplémentaire afin d'obtenir directement une variable du type testé :
+[source,java]
+----
+void callBarkIfPossible(Animal animal) {
+    if (animal instanceof Dog dog) {
+        dog.bark();
+    }
+}
+----
+
 === Nommage
 
 Le nommage a un intérêt prépondérant dans le paradigme objet où le développeur essaie d’exprimer des concepts réels.
diff --git a/index.adoc b/index.adoc
index 5cb1225..7a3c80e 100644
--- a/index.adoc
+++ b/index.adoc
@@ -1,10 +1,11 @@
 = Java 101
 Loïc Ledoyen <loic.ledoyen@gmail.com>
 :reproducible:
+:toc-title: Java 101
 :listing-caption: Listing
 :source-highlighter: rouge
 :hardbreaks-option:
-:toc:
+:toc: left
 :title-page:
 
 ifndef::ci[]