diff --git a/content/notes/think-writing.md b/content/notes/think-writing.md
index ff660c8a9..fbfb8e1e5 100644
--- a/content/notes/think-writing.md
+++ b/content/notes/think-writing.md
@@ -99,4 +99,6 @@ Did some research on [[merkle tree]]s. Think in bitcoin and ethereum the raw dat
 
 https://www.makeuseof.com/what-data-stored-bitcoin-blockchain/ From here it seems that within a block the transactions are stored separately from the merkle tree. And the number of transactions in a block cannot take up more than 1MB.
 
-https://hackernoon.com/getting-deep-into-ethereum-how-data-is-stored-in-ethereum-e3f669d96033 [[ethereum#storage]]
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+https://hackernoon.com/getting-deep-into-ethereum-how-data-is-stored-in-ethereum-e3f669d96033 [[ethereum#storage]]
+
+https://medium.com/cybermiles/diving-into-ethereums-world-state-c893102030ed
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