--- a/_config.yml	Wed May 20 13:28:25 2020 +0900
+++ b/_config.yml	Wed May 20 14:05:39 2020 +0900
@@ -1,11 +1,20 @@
 # Welcome to Jekyll!
 #
 # This config file is meant for settings that affect your whole blog, values
-# which you are expected to set up once and rarely need to edit after that.
+# which you are expected to set up once and rarely edit after that. If you find
+# yourself editing this file very often, consider using Jekyll's data files
+# feature for the data you need to update frequently.
+#
 # For technical reasons, this file is *NOT* reloaded automatically when you use
-# 'jekyll serve'. If you change this file, please restart the server process.
+# 'bundle exec jekyll serve'. If you change this file, please restart the server
+# process.
+
 
 # Site settings
+# These are used to personalize your new site. If you look in the HTML files,
+# you will see them accessed via {{ site.title }}, {{ site.email }}, and so on.
+# You can create any custom variable you would like, and they will be accessible
+# in the templates via {{ site.myvariable }}.
 title: GNU Octave
 email: maintainers@octave.org
 description: > # this means to ignore newlines until "baseurl:"
@@ -27,4 +36,12 @@
 markdown: kramdown
 highlighter: pygments
 
-exclude: ["Makefile"]
+exclude:
+  - Makefile
+  - Gemfile
+  - Gemfile.lock
+  - node_modules
+  - vendor/bundle/
+  - vendor/cache/
+  - vendor/gems/
+  - vendor/ruby/