diff --git a/_config.yml b/_config.yml
index 373784e..76fa52c 100644
--- a/_config.yml
+++ b/_config.yml
@@ -100,6 +100,8 @@ comments:
     mapping: # optional, default to 'pathname'
     input_position: # optional, default to 'bottom'
     lang: # optional, default to the value of `site.lang`
+    light_theme: # optional, defaults to 'light'
+    dark_theme: # optional, defaults to 'dark_dimmed'
     reactions_enabled: # optional, default to the value of `1`
 
 # Self-hosted static assets, optional › https://github.com/cotes2020/chirpy-static-assets
diff --git a/_includes/comments/giscus.html b/_includes/comments/giscus.html
index 8f04246..ad428f4 100644
--- a/_includes/comments/giscus.html
+++ b/_includes/comments/giscus.html
@@ -3,8 +3,8 @@
   (function () {
     const origin = 'https://giscus.app';
     const iframe = 'iframe.giscus-frame';
-    const lightTheme = 'light';
-    const darkTheme = 'dark_dimmed';
+    const lightTheme = '{{ site.comments.giscus.light_theme | default: 'light' }}';
+    const darkTheme = '{{ site.comments.giscus.dark_theme | default: 'dark_dimmed' }}';
 
     let initTheme = lightTheme;
     const html = document.documentElement;