diff --git a/site/_docs/plugins.md b/site/_docs/plugins.md
index 63fc5d36..99d7498b 100644
--- a/site/_docs/plugins.md
+++ b/site/_docs/plugins.md
@@ -538,6 +538,7 @@ LESS.js files during generation.
 - [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.
 - [Jekyll-Smartify](https://github.com/pathawks/jekyll-smartify): SmartyPants filter. Make "quotes" “curly”
+- [liquid-md5](https://github.com/pathawks/liquid-md5): Returns an MD5 hash. Helpful for generating Gravatars in templates.
 
 #### Tags