diff --git a/site/_docs/plugins.md b/site/_docs/plugins.md
index bd4396b3..cd9e1942 100644
--- a/site/_docs/plugins.md
+++ b/site/_docs/plugins.md
@@ -534,6 +534,7 @@ You can find a few useful plugins at the following locations:
 - [Jekyll-Ordinal](https://github.com/PatrickC8t/Jekyll-Ordinal): Jekyll liquid filter to output a date ordinal such as "st", "nd", "rd", or "th".
 - [Deprecated articles keeper](https://github.com/kzykbys/JekyllPlugins) by [Kazuya Kobayashi](http://blog.kazuya.co/): A simple Jekyll filter which monitor how old an article is.
 - [Jekyll-jalali](https://github.com/mehdisadeghi/jekyll-jalali) by [Mehdi Sadeghi](http://mehdix.ir): A simple Gregorian to Jalali date converter filter.
+- [Jekyll Thumbnail Filter](https://github.com/matallo/jekyll-thumbnail-filter): Related posts thumbnail filter.
 
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