diff --git a/config.rb b/config.rb
index e0f2479edb4..24887979fea 100644
--- a/config.rb
+++ b/config.rb
@@ -8,6 +8,7 @@
     smartypants: true,
     disable_indented_code_blocks: true,
     prettify: true,
+    strikethrough: true,
     tables: true,
     with_toc_data: true,
     no_intra_emphasis: true,