diff --git a/views/layout.erb b/views/layout.erb
index 6caae89..459a657 100644
--- a/views/layout.erb
+++ b/views/layout.erb
@@ -10,11 +10,17 @@
   <meta property="og:site_name" content="My Willpower">
   <meta property="og:image"
         content="http://www.mywillpower.org/images/tip.jpg">
+  <meta property="og:image:alt"
+        content="A man standing on the summit of a mountain with his arms
+                 outstretched above his head.">
   <meta name="twitter:card" content="summary_large_image">
   <meta name="twitter:title" content="My Willpower">
   <meta name="twitter:description" content="One man's journey.">
   <meta name="twitter:image"
         content="http://www.mywillpower.org/images/tip.jpg">
+  <meta name="twitter:image:alt"
+        content="A man standing on the summit of a mountain with his arms
+                 outstretched above his head.">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="description"
         content="One man's journey to summon his own calm from within.">