diff --git a/slides/chapter-10.en.md b/slides/chapter-10.en.md
index ce3fc28..9ff55db 100644
--- a/slides/chapter-10.en.md
+++ b/slides/chapter-10.en.md
@@ -121,7 +121,7 @@ Listing source code
 
 @content
 * In the directory `exercises/source-code-listings` you can find a file named `Source.java`, which we want to include in our document.
-* ++ **Include** the java code in the file `task-1.tex1`.
+* ++ **Include** the java code in the file `task-1.tex`.
 * ++ **Number** the code lines.
 * ++ Use the **theme** `native`.
 * ++ Change the **background colour** to dark blue.