diff --git a/site-cookbooks/kosmos-mediawiki/recipes/default.rb b/site-cookbooks/kosmos-mediawiki/recipes/default.rb
index 5046629..4f24146 100644
--- a/site-cookbooks/kosmos-mediawiki/recipes/default.rb
+++ b/site-cookbooks/kosmos-mediawiki/recipes/default.rb
@@ -165,6 +165,8 @@ end
 
 ruby_block "configuration" do
   block do
+    # FIXME This is internal Chef API and should not be used from recipes, as
+    # it is unsupported for that
     file = Chef::Util::FileEdit.new("#{node['mediawiki']['webdir']}/LocalSettings.php")
     file.search_file_replace_line(%r{\$wgLogo\ =\ \"\$wgResourceBasePath\/resources\/assets\/wiki.png\";},
                                   "$wgLogo = \"$wgResourceBasePath/skins/common/images/kosmos.png\";")