docs: Document UniqueID page variable

diff --git a/docs/content/templates/variables.md b/docs/content/templates/variables.md
index 25557c2ecbeb254b7b2ba58f39924ecfb6d6d76d..ec72d9652d5e630ed889327dd01f9616daa9ca99 100644 (file)
--- a/docs/content/templates/variables.md
+++ b/docs/content/templates/variables.md
@@ -51,6 +51,7 @@ matter, content or derived from file location.
 **.ReadingTime** The estimated time it takes to read the content in minutes.<br>
 **.Weight** Assigned weight (in the front matter) to this content, used in sorting.<br>
 **.RawContent** Raw Markdown content without the metadata header. Useful with [remarkjs.com](http://remarkjs.com)<br>
+**.UniqueID** The MD5-checksum of the page's filename
 **.Draft** A boolean, `true` if the content is marked as a draft in the front matter.<br>
 **.IsNode** Always false for pages.<br>
 **.IsPage** Always true for page.<br>