diff --git a/theme/templates/includes/book/header.html b/theme/templates/includes/book/header.html
index 87c300f3f..e6b9ab2b7 100644
--- a/theme/templates/includes/book/header.html
+++ b/theme/templates/includes/book/header.html
@@ -1,25 +1,25 @@
 <div class="book-header">
     <!-- Actions Left -->
     {% if options.links.home !== false and (options.links.home != null or githubId) %}
-    <a href="{{ options.links.home|default(githubHost+githubId) }}" target="_blank" class="btn pull-left"><i class="fa fa-bookmark-o"></i></a>
+    <a href="{{ options.links.home|default(githubHost+githubId) }}" target="_blank" class="btn pull-left" aria-label="GitHub home"><i class="fa fa-bookmark-o"></i></a>
     {% endif %}
-    <a href="#" class="btn pull-left toggle-summary"><i class="fa fa-align-justify"></i></a>
-    <a href="#" class="btn pull-left toggle-search"><i class="fa fa-search"></i></a>
+    <a href="#" class="btn pull-left toggle-summary" aria-label="Toggle summary"><i class="fa fa-align-justify"></i></a>
+    <a href="#" class="btn pull-left toggle-search" aria-label="Toggle search"><i class="fa fa-search"></i></a>
     <span id="font-settings-wrapper">
-        <a href="#" class="btn pull-left toggle-font-settings"><i class="fa fa-font"></i>
+        <a href="#" class="btn pull-left toggle-font-settings" aria-label="Toggle font settings"><i class="fa fa-font"></i>
         </a>
         {% include "./font-settings.html" %}
     </span>
 
     <!-- Actions Right -->
     {% if options.links.sharing.google !== false %}
-    <a href="#" target="_blank" class="btn pull-right" data-sharing="google-plus"><i class="fa fa-google-plus"></i></a>
+    <a href="#" target="_blank" class="btn pull-right" data-sharing="google-plus" aria-label="Share on Google Plus"><i class="fa fa-google-plus"></i></a>
     {% endif %}
     {% if options.links.sharing.facebook !== false %}
-    <a href="#" target="_blank" class="btn pull-right" data-sharing="facebook"><i class="fa fa-facebook"></i></a>
+    <a href="#" target="_blank" class="btn pull-right" data-sharing="facebook" aria-label="Share on Facebook"><i class="fa fa-facebook"></i></a>
     {% endif %}
     {% if options.links.sharing.twitter !== false %}
-    <a href="#" target="_blank" class="btn pull-right" data-sharing="twitter"><i class="fa fa-twitter"></i></a>
+    <a href="#" target="_blank" class="btn pull-right" data-sharing="twitter" aria-label="Share on Twitter"><i class="fa fa-twitter"></i></a>
     {% endif %}
 
     {% if githubId %}