diff --git a/_config.yml b/_config.yml
index 3985c96..525bc33 100644
--- a/_config.yml
+++ b/_config.yml
@@ -79,6 +79,10 @@ img_cdn: https://raw.githubusercontent.com/Edu4rdSHL/edu4rdshl.github.io/main/_i
 # the avatar on sidebar, support local or CORS resources
 avatar: /edu4rdshl.jpeg
 
+# The URL of the site-wide social preview image used in SEO `og:image` meta tag.
+# It can be overridden by a customized `page.image` in front matter.
+social_preview_image: # string, local or CORS resources
+
 # boolean type, the global switch for TOC in posts.
 toc: true
 
@@ -178,12 +182,11 @@ compress_html:
 exclude:
   - "*.gem"
   - "*.gemspec"
+  - docs
   - tools
   - README.md
-  - CHANGELOG.md
   - LICENSE
   - rollup.config.js
-  - node_modules
   - package*.json
 
 jekyll-archives: