diff --git a/tools for thinking.md b/tools for thinking.md
index 837552248..0aa738c5e 100644
--- a/tools for thinking.md	
+++ b/tools for thinking.md	
@@ -216,6 +216,11 @@
     - took some time off here to post about this to social networks: [[gordon brander]] is building an [[agora]]! they don't call it that, but that doesn't matter. It looks technically advanced too.
     - [[memos]] are a really flexible data structure
       - (super-thoughts? preceded them?)
+      - very generic content: they are essentially [[envelopes]] that can carry anything
+      - [[envelope]] has:
+        - [[header metadata]] 
+        - a pointer to some content on [[ipfs]]
+        - a pointer to the previous version on [[ipfs]]
 
 ## [[The History and Future of Software as Tools for Thinking]]