diff --git a/templates/site-layout.html b/templates/site-layout.html
index 257dda2..d0b2e56 100644
--- a/templates/site-layout.html
+++ b/templates/site-layout.html
@@ -243,7 +243,7 @@
 	<!--! xml:lang avoids extraction for translation -->
 	<input xml:lang="en" type="hidden" name="cmd" value="_s-xclick" />
 	<input xml:lang="en" type="hidden" name="hosted_button_id" value="XKAL6BZL3YPSN" />
-	<input type="image"  name="submit"
+	<input type="image" alt="paypal icon" name="submit"
 	       src="/pics/paypal/${os.paypal_lang}.gif"
 	       title="Send us money through PayPal." />
       </div>