diff --git a/sandbox/index.mdwn b/sandbox/index.mdwn
index c66044ef3..6c5739e59 100644
--- a/sandbox/index.mdwn
+++ b/sandbox/index.mdwn
@@ -9,6 +9,14 @@ Formatting is in Markdown.
 
 -------
 
+Related keywords:
+
+- personal knowlege graph
+- personal knowledge management
+- tools for thought
+
+---
+
 - <http://zeitgeist-project.com/>
 - <http://standardanalytics.io/>
 - <https://github.com/sballesteros/dcat>