diff --git a/Supporting materials/README.md b/Supporting materials/supporting.md
similarity index 88%
rename from Supporting materials/README.md
rename to Supporting materials/supporting.md
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--- a/Supporting materials/README.md	
+++ b/Supporting materials/supporting.md	
@@ -36,6 +36,14 @@
 
 <https://github.com/ivfranco/notes>
 
+## Diagram drawing tool - Draw.io
+
+<https://app.diagrams.net/>
+
+## Note taking tool - Obsidian
+
+<https://obsidian.md/>
+
 ## Books
 
 You can find solution manuals for the textbooks from the internet, or send me an email.