diff --git a/docs/DEV_SESSIONS.md b/docs/DEV_SESSIONS.md
index a4757d5dd..dd8fdbb7f 100644
--- a/docs/DEV_SESSIONS.md
+++ b/docs/DEV_SESSIONS.md
@@ -9,25 +9,30 @@ decision making process, technical information, update cycles etc.
 
 ## List
 
-| Date            | Topic                                     | Link(s)                                                                                                           |
-| --------------- | ----------------------------------------- | -------------------------------------------------------------------------------------------------------------- |
-| August 2019     | Part Three: Tendermint Lite Client        | [YouTube](https://www.youtube.com/watch?v=whyL6UrKe7I&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)         |
-| August 2019     | Fork Accountability                       | [YouTube](https://www.youtube.com/watch?v=Jph-4PGtdPo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)         |
-| July 2019       | Part Two: Tendermint Lite Client          | [YouTube](https://www.youtube.com/watch?v=gTjG7jNNdKQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)         |
-| July 2019       | Part One: Tendermint Lite Client          | [YouTube](https://www.youtube.com/watch?v=C6fH_sgPJzA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)         |
-| June 2019       | Testnet Deployments                       | [YouTube](https://www.youtube.com/watch?v=gYA6no7tRlM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)        |
-| June 2019       | Blockchain Reactor Refactor               | [YouTube](https://www.youtube.com/watch?v=JLBGH8yxABk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)        |
-| June 2019       | Tendermint Rust Libraries                 | [YouTube](https://www.youtube.com/watch?v=-WXKdyoGHwA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)         |
-| May 2019        | Merkle Tree Deep Dive                     | [YouTube](https://www.youtube.com/watch?v=L3bt2Uw8ICg&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)         |
-| May 2019        | Remote Signer Refactor                    | [YouTube](https://www.youtube.com/watch?v=eUyXXEEuBzQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=12)        |
-| May 2019        | Introduction to Ansible                   | [YouTube](https://www.youtube.com/watch?v=72clQLjzPg4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=14&t=0s)   |  |  |
-| April 2019      | Tendermint State Sync Design Discussion   | [YouTube](https://www.youtube.com/watch?v=4k23j2QHwrM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)        |
-| April 2019      | ADR-036 - Blockchain Reactor Refactor     | [YouTube](https://www.youtube.com/watch?v=TW2xC1LwEkE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)        |
-| April 2019      | Verifying Distributed Algorithms          | [YouTube](https://www.youtube.com/watch?v=tMd4lgPVBxE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)         |
-| April 2019      | Byzantine Model Checker Presentation      | [YouTube](https://www.youtube.com/watch?v=rdXl4VCQyow&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)         |
-| January 2019    | Proposer Selection in Idris               | [YouTube](https://www.youtube.com/watch?v=hWZdc9c1aH8&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)         |
-| January 2019    | Current Mempool Design                    | [YouTube](https://www.youtube.com/watch?v=--iGIYYiLu4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)         |
-| December 2018   | ABCI Proxy App                            | [YouTube](https://www.youtube.com/watch?v=s6sQ2HOVHdo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)         |
-| October 2018    | DB Performance                            | [YouTube](https://www.youtube.com/watch?v=jVSNHi4l0fQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)         |
-| October 2018    | Alternative Mempool Algorithms            | [YouTube](https://www.youtube.com/watch?v=XxH5ZtM4vMM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)         |
-| October 2018    | Tendermint Termination                    | [YouTube](https://www.youtube.com/watch?v=YBZjecfjeIk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)                 |
+| Date           | Topic                                                       | Link(s)                                                                                                      |
+| -------------- | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
+| October 2019   | ABCI Overview (1/2)                                         | [YouTube](https://www.youtube.com/watch?v=I3OnA8yCHl4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)               |
+| September 2019 | IAVL+ Presentation                                          | [YouTube](https://www.youtube.com/watch?v=e5wwBaCTc9Y&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)       |
+| September 2019 | Tendermint Dev Session - Blockchain Reactor in TLA+         | [YouTube](https://www.youtube.com/watch?v=q0e0pEQ5aiY&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=3)       |
+| September 2019 | Tendermint Code Review - SkipTimeoutCommit & Block Rollback | [YouTube](https://www.youtube.com/watch?v=MCo_oH7rys8&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
+| September 2019 | Tendermint Evidence Handling                                | [YouTube](https://www.youtube.com/watch?v=-4H3_DVlYRk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
+| August 2019    | Part Three: Tendermint Lite Client                          | [YouTube](https://www.youtube.com/watch?v=whyL6UrKe7I&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
+| August 2019    | Fork Accountability                                         | [YouTube](https://www.youtube.com/watch?v=Jph-4PGtdPo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
+| July 2019      | Part Two: Tendermint Lite Client                            | [YouTube](https://www.youtube.com/watch?v=gTjG7jNNdKQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)       |
+| July 2019      | Part One: Tendermint Lite Client                            | [YouTube](https://www.youtube.com/watch?v=C6fH_sgPJzA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)       |
+| June 2019      | Testnet Deployments                                         | [YouTube](https://www.youtube.com/watch?v=gYA6no7tRlM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)      |
+| June 2019      | Blockchain Reactor Refactor                                 | [YouTube](https://www.youtube.com/watch?v=JLBGH8yxABk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)      |
+| June 2019      | Tendermint Rust Libraries                                   | [YouTube](https://www.youtube.com/watch?v=-WXKdyoGHwA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)       |
+| May 2019       | Merkle Tree Deep Dive                                       | [YouTube](https://www.youtube.com/watch?v=L3bt2Uw8ICg&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)       |
+| May 2019       | Remote Signer Refactor                                      | [YouTube](https://www.youtube.com/watch?v=eUyXXEEuBzQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=12)      |
+| May 2019       | Introduction to Ansible                                     | [YouTube](https://www.youtube.com/watch?v=72clQLjzPg4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=14&t=0s) |
+| April 2019     | Tendermint State Sync Design Discussion                     | [YouTube](https://www.youtube.com/watch?v=4k23j2QHwrM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)      |
+| April 2019     | ADR-036 - Blockchain Reactor Refactor                       | [YouTube](https://www.youtube.com/watch?v=TW2xC1LwEkE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)      |
+| April 2019     | Verifying Distributed Algorithms                            | [YouTube](https://www.youtube.com/watch?v=tMd4lgPVBxE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)       |
+| April 2019     | Byzantine Model Checker Presentation                        | [YouTube](https://www.youtube.com/watch?v=rdXl4VCQyow&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)       |
+| January 2019   | Proposer Selection in Idris                                 | [YouTube](https://www.youtube.com/watch?v=hWZdc9c1aH8&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)       |
+| January 2019   | Current Mempool Design                                      | [YouTube](https://www.youtube.com/watch?v=--iGIYYiLu4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)       |
+| December 2018  | ABCI Proxy App                                              | [YouTube](https://www.youtube.com/watch?v=s6sQ2HOVHdo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
+| October 2018   | DB Performance                                              | [YouTube](https://www.youtube.com/watch?v=jVSNHi4l0fQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
+| October 2018   | Alternative Mempool Algorithms                              | [YouTube](https://www.youtube.com/watch?v=XxH5ZtM4vMM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)       |
+| October 2018   | Tendermint Termination                                      | [YouTube](https://www.youtube.com/watch?v=YBZjecfjeIk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)               |