diff --git a/authors.html b/authors.html
index 3d43d75e..0efc4059 100644
--- a/authors.html
+++ b/authors.html
@@ -52,7 +52,7 @@ reading and
 </p>
 <p>
 You can contact me by email using the address
-<img align="bottom" src="email.png">
+<img align="bottom" src="email.png" alt="email">
 </p>