diff --git a/about.html b/about.html
index 0c382e8..465b3c2 100644
--- a/about.html
+++ b/about.html
@@ -19,7 +19,7 @@
       <h2>This is me</h2>
     </header>
 
-    <img src="./assets/html_joke.jpg">
+    <img src="./assets/html_joke.jpg" alt="An html joke">
     <!-- Source: http://funnygeekjokes.blogspot.com/2013/02/how-to-tell-html-from-html5-joke.html -->
 
     <p>