diff --git a/content/notes/22-open-source-software.md b/content/notes/22-open-source-software.md
index 6c389ebb4..334153160 100644
--- a/content/notes/22-open-source-software.md
+++ b/content/notes/22-open-source-software.md
@@ -67,4 +67,10 @@ tags:
 	- need to be sure that code can be maintained
 	- e.g., google wave 
 
-# Understand sustainability challenges
\ No newline at end of file
+# Understand sustainability challenges
+- need mechanisms to keep project resouced
+	- e.g., financial support for key developers
+- sustainability - software is seldom "finished"
+	- new features require development
+	- bugs need fiing, but hobbyists don't give 24/7 service
+	- older code within project may nee