diff --git a/lib/docs/filters/git/clean_html.rb b/lib/docs/filters/git/clean_html.rb
index 6b76e1f0..b2433a76 100644
--- a/lib/docs/filters/git/clean_html.rb
+++ b/lib/docs/filters/git/clean_html.rb
@@ -42,6 +42,8 @@ module Docs
 
         css('pre').each do |node|
           node.content = node.content.gsub("\t", ' ' * 8)
+          node['data-language'] = 'shell' if node.content.starts_with?('git ')
+          node['data-language'] = 'shell-session' if node.content[0] == '$'
         end
       end
     end