add note about blank lines..

NOTES.md

@@ -90,3 +90,9 @@ immediate children.  Add a `>` to restrict it.
 
 Hack to make a CSS only clickable be exposed in order to handle the nav bar:
 https://stackoverflow.com/questions/6019845/show-hide-div-on-click-with-css
+
+TODO
+====
+
+Using triple back-tick will eat blank lines due to wrapping them in code tags,
+which will not have any characters in them.  Figure out how to fix this.