diff --git a/IPs/RSKIP436.md b/IPs/RSKIP436.md
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+---
+rskip: 436
+title: Network Upgrade (patch) - Arrowhead 6.3.1
+description: 
+status: Draft
+purpose: Usa
+author: AE
+layer: Core
+complexity: 2
+created: 2024-07-04
+---
+# Network Upgrade (patch): Arrowhead 6.3.1
+
+|RSKIP          |436           |
+| :------------ |:-------------|
+|**Title**      |Network Upgrade (patch): Arrowhead 6.3.1 |
+|**Created**    |04-JUL-2024 |
+|**Author**     |AE |
+|**Purpose**    |Usa |
+|**Layer**      |Core |
+|**Complexity** |2 |
+|**Status**     |Draft |
+
+## Abstract
+
+This RSKIP specifies the changes included in the Rootstock patch network upgrade Arrowhead 6.3.1. This network upgrade aims to fix the issue that caused the PowPeg service outage, as described in [1]. This patch is only intended for the Rootstock Mainnet network.
+
+## Specification
+
+- Codename: Arrowhead 6.3.1
+- Activation:
+	- Rootstock Mainnet block: To be confirmed
+	- Rootstock Testnet block: N/A
+- Open for comments until Jul, 9th, 2024.
+
+### Included RSKIPs
+
+### Accepted RSKIPs
+
+### Rejected RSKIPs
+
+- No rejected RSKIPs so far
+
+### Proposed RSKIPs
+
+- [RSKIP-434](https://github.com/rsksmart/RSKIPs/blob/master/IPs/RSKIP434.md): Bridge Bitcoin block chainwork up to 12 Bytes
+
+## Timeline
+
+- Jul-4-24: RSKIP created and proposed RSKIPs listed
+
+## References
+
+[1] [Incident report: Rootstock peg-in / peg-out service outage on June 24th](https://blog.rootstock.io/noticia/incident-report-rootstock-peg-in-peg-out-service-outage-on-june-24th/)
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
+
+
+
diff --git a/README.md b/README.md
index ec4ba6f4..8e18ed7e 100644
--- a/README.md
+++ b/README.md
@@ -232,6 +232,7 @@ You can find an easily browseable version of this information [here](https://ips
 | 428 | [New pegout creation event including UTXO outpoint values](IPs/RSKIP428.md)| 23-APR-24 | NC, MI | Sca, Sec | Core | 1 | Draft |
 | 434 |[Bridge Bitcoin block chainwork up to 12 unsigned bytes](IPs/RSKIP434.md)| 26-Jun-24 | JD,JZ,MI | Sec | Core | 1 | Draft |
 | 435 |[Network Upgrade: Lovell](IPs/RSKIP435.md)|27-JUN-24 | AE | Usa, Sec, Sca | Core | 2 | Draft |
+| 436 |[Network Upgrade (patch): Arrowhead 6.3.1](IPs/RSKIP436.md)|4-JUL-24 | AE | Usa | Core | 2 | Draft |
 
 (*) Under evaluation to be implemented in the next reference client release