diff --git a/GitHubPages.gitignore b/GitHubPages.gitignore
index fddfb6b9..493e69ba 100644
--- a/GitHubPages.gitignore
+++ b/GitHubPages.gitignore
@@ -14,4 +14,5 @@ _site/
 # GitHub Pages will always use its own deployed version of pages-gem 
 # This means GitHub Pages will NOT use your Gemfile.lock and therefore it is
 # counterproductive to check this file into the repository.
+# Details at https://github.com/github/pages-gem/issues/768
 Gemfile.lock