diff --git a/en/02_Developer_Guides/01_Templates/01_Syntax.md b/en/02_Developer_Guides/01_Templates/01_Syntax.md
index 16b318a2..82c79121 100644
--- a/en/02_Developer_Guides/01_Templates/01_Syntax.md
+++ b/en/02_Developer_Guides/01_Templates/01_Syntax.md
@@ -575,7 +575,7 @@ use Page;
 
 class HomePage extends Page
 {
-    public function forTemplate()
+    public function forTemplate(): string
     {
         // We can also render a template here using $this->renderWith()
         return 'Page: ' . $this->Title;
diff --git a/en/02_Developer_Guides/15_Customising_the_Admin_Interface/04_Preview.md b/en/02_Developer_Guides/15_Customising_the_Admin_Interface/04_Preview.md
index 0ef01c72..ad892e8d 100644
--- a/en/02_Developer_Guides/15_Customising_the_Admin_Interface/04_Preview.md
+++ b/en/02_Developer_Guides/15_Customising_the_Admin_Interface/04_Preview.md
@@ -292,7 +292,7 @@ class Product extends DataObject implements CMSPreviewable
 {
     // ...
 
-    public function forTemplate()
+    public function forTemplate(): string
     {
         // If the template for this DataObject is not an "Include" template, use the appropriate type here
         // e.g. "Layout".