diff --git a/.mdl_style.rb b/.mdl_style.rb
index 34e25d64ae78883f8cce0dd226056446294ae428..9e94bc07b747b0e7e4519fa68d917bd974c7fc8a 100644
--- a/.mdl_style.rb
+++ b/.mdl_style.rb
@@ -1,9 +1,8 @@
 all
 # our changelog does this, by design
 # exclude_rule 'MD003'
-# default in next version, remove then
-#   "MD003": { "style": "atx_closed" 
 # rule 'MD007', :indent => 3
-# doesn't work for style
+rule 'MD013', :heading_line_length => 90
+# => doesn't work for style
 # rule 'MD029', :style => :ordered
 rule "MD029", style: "ordered"