diff --git a/Gemfile b/Gemfile
index 7dcf653..c8def87 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source "https://rubygems.org"
 
 gem 'github-pages'
+# this gem provides regeneration support improvements on Windows
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
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