diff --git a/docs/src/validator/tpu.md b/docs/src/validator/tpu.md
index 54a5ea1825..7473c8940d 100644
--- a/docs/src/validator/tpu.md
+++ b/docs/src/validator/tpu.md
@@ -2,4 +2,27 @@
 title: TPU
 ---
 
+TPU (Transaction Processing Unit) is the logic of the validator
+repsonsible for block production.
+
 ![TPU Block Diagram](/img/tpu.svg)
+
+Transactions encoded and sent in UDP packets flow into the validator
+from clients (other validators/users of the network) as follows:
+
+* fetch stage: allocates packet memory and reads the packet data from
+the network socket and applies some coalescing of packets received at
+the same time.
+
+* sigverify stage: deduplicates packets and applies some load-shedding
+to remove excessive packets before then filtering packets with invalid
+signatures by setting the packet's discard flag.
+
+* banking stage: decides whether to forward, hold or process packets
+received. Once it detects the node is the block producer it processes
+held packets and newly received packets with a Bank at the tip slot.
+
+* broadcast stage: receives the valid transactions formed into Entry's from
+banking stage and packages them into shreds to send to network peers through
+the turbine tree structure. Serializes, signs, and generates erasure codes
+before sending the packets to the appropriate network peer.