diff --git a/index.md b/index.md
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--- a/index.md
+++ b/index.md
@@ -12,13 +12,13 @@ The Ethereum Cat Herders are a group of independent contributors serving the Eth
 ## Upcoming Network Upgrade
 On 16 January 2019, a decision was taken to postpone the upgrade of the Ethereum Network, the upgrade named “Constantinople”, scheduled to complete on 17 December 2019.
 
-The next network upgrade "Constantinople 2" is targeted at **27 February 2019**, block number **7.280.000**.
+The next network upgrade "Constantinople 2" (also called "Petersburg") is targeted at **27 February 2019**, block number **7.280.000**. Technically, both Constantinople 1 and 2 are activated at the same block, where Contstantinople 1 will activate all EIPs and Constantinople 2 will deactivate EIP 1283 immediately due to [security concerns](https://blog.ethereum.org/2019/01/15/security-alert-ethereum-constantinople-postponement/).
 
-- [Bitwise shifting instructions in EVM](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-145.md)
-- [Skinny CREATE2](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1014.md)
-- [EXTCODEHASH Opcode](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1052.md)
-- [Delay difficulty bomb, adjust block reward](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1234.md)
-- [Net gas metering for SSTORE without dirty maps](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1283.md)
+- [EIP 145: Bitwise shifting instructions in EVM](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-145.md)
+- [EIP 1014: Skinny CREATE2](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1014.md)
+- [EIP 1052: EXTCODEHASH Opcode](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1052.md)
+- [EIP 1234: Delay difficulty bomb, adjust block reward](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1234.md)
+- ~[EIP 1283: Net gas metering for SSTORE without dirty maps](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1283.md)~
 
 All major clients have already implemented these changes. Progress can be tracked [here](https://github.com/ethereum/pm/wiki/Constantinople-Progress-Tracker).