diff --git a/_source/_plugins/webrick_range_fix.rb b/_source/_plugins/webrick_range_fix.rb
index e25dcda..a2a3552 100644
--- a/_source/_plugins/webrick_range_fix.rb
+++ b/_source/_plugins/webrick_range_fix.rb
@@ -5,6 +5,10 @@
 # metadata, so this breaks video playback under `jekyll serve`.
 # See https://github.com/ruby/webrick/blob/master/lib/webrick/httpservlet/filehandler.rb
 #
+# Upstream bug, not yet fixed as of writing:
+# https://github.com/ruby/webrick/pull/173 (fix if-range returning 304 instead of 206/200)
+# https://github.com/ruby/webrick/pull/169 (do not cache range requests)
+# Drop this plugin once one of those lands in a released webrick version.
 require 'webrick'
 
 module WebrickRangeFix