diff --git a/NOTES.md b/NOTES.md
index a0383a1..b711675 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -116,3 +116,6 @@ todo
 eventually this should support mathjax and highlighted code and stuff
 mathjax should be rendered as the mozilla native math thing with a javascript polyfill for gogle
 chrombe and others
+
+nginx caching -
+https://blog.theodo.com/2016/06/improve-the-performance-of-your-webapp-configure-nginx-to-cache/