diff --git a/The-Merge/running-a-validator.md b/The-Merge/running-a-validator.md
index f8feabb..251761e 100644
--- a/The-Merge/running-a-validator.md
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@@ -1,5 +1,20 @@
 ## Nodes and validators
 
+
+<br>
+
+- the validator is responsible for creating a new block and sending it out to other nodes on the network.
+- to participate as a validators, a user must deposit 32 ETH into the deposit contract and run 3 pieces of software: - an execution client - a consensus client - a validator
+- once activated, validators receive new blocsk from peers - the txs delivered in the block are re-executed, and the block signature is checked
+- the validator then sends a vote (attestation) in favor of that block across the network
+- the timing of blocks is not determined by the mining difficult anymore, but it's fixed:
+
+    - slots (12 seconds)
+    - epochs (32 slots)
+
+- in every slot, a committee of validators is randomly chosen, whose votes are used to determine the validity of the block being proposed
+- the first block in each epoch is a checkpoint
+
 <br>
 
 ### Setting a dedicated hardware