Merge pull request #725 from sandakersmann/patch-1

Add roll out strategy for Shanghai

README.md

@@ -30,7 +30,7 @@ This repository contains the consensus specifications related to the Ethereum ex
 | Frontier Thawing | 200000 | 2015-09-07 | | | [Blog](https://blog.ethereum.org/2015/08/04/the-thawing-frontier/) |
 | Frontier | 1 | 2015-07-30 | | | [Blog](https://blog.ethereum.org/2015/07/22/frontier-is-coming-what-to-expect-and-how-to-prepare/) |
 
-*Note:* Starting with Paris, updates are not rolled out based on block numbers. Paris was enabled once TTD reached 58750000000000000000000. Updates after Paris are yet to have a decided roll out strategy.
+*Note:* Starting with Paris, updates are no longer rolled out based on block numbers. Paris was enabled once proof-of-work Total Difficulty reached 58750000000000000000000. As of Shanghai, upgrade activation is based on timestamps.
 
 Some clarifications were enabled without protocol releases: