Breaking changes list (#1052)

* Start of new BREAKING.md changes list

* more

* Make NIP column into links

* notes

* Make commits links

* Remove optional P tag entry, was not breaking

* Update BREAKING with nip-49 breaking change

2 files changed, 26 insertions, 0 deletions

diff --git a/BREAKING.md b/BREAKING.md
new file mode 100644
index 0000000..2a85a28
--- /dev/null
+++ b/BREAKING.md
@@ -0,0 +1,21 @@
+# Breaking Changes
+
+This is a history of NIP changes that potentially break pre-existing implementations, in
+reverse chronological order.
+
+| Date        | Commit    | NIP      | Change |
+| ----------- | --------- | -------- | ------ |
+| 2024-02-16  | [cbec02ab](https://github.com/nostr-protocol/nips/commit/cbec02ab) | [NIP-49](49.md) | Password first normalized to NFKC |
+| 2024-02-15  | [afbb8dd0](https://github.com/nostr-protocol/nips/commit/afbb8dd0) | [NIP-39](39.md) | PGP identity was removed |
+| 2024-02-07  | [d3dad114](https://github.com/nostr-protocol/nips/commit/d3dad114)  | [NIP-46](46.md) | Connection token format was changed |
+| 2024-01-30  | [1a2b21b6](https://github.com/nostr-protocol/nips/commit/1a2b21b6)  | [NIP-59](59.md) | 'p' tag became optional |
+| 2023-01-27  | [c2f34817](https://github.com/nostr-protocol/nips/commit/c2f34817)  | [NIP-47](47.md) | optional expiration tag should be honored |
+| 2024-01-10  | [3d8652ea](https://github.com/nostr-protocol/nips/commit/3d8652ea)  | [NIP-02](02.md) | list entries should be chronological |
+| 2024-01-10  | [3d8652ea](https://github.com/nostr-protocol/nips/commit/3d8652ea)  | [NIP-51](51.md) | list entries should be chronological |
+
+Breaking changes prior to 2024-01-01 are not yet documented.
+
+## NOTES
+
+- If it isn't clear that a change is breaking or not, we list it.
+- The date is the date it was merged, not necessarily the date of the commit.
diff --git a/README.md b/README.md
index caecc01..b9ca8aa 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 - [Criteria for acceptance of NIPs](#criteria-for-acceptance-of-nips)
 - [Is this repository a centralizing factor?](#is-this-repository-a-centralizing-factor)
 - [How this repository works](#how-this-repository-works)
+- [Breaking Changes](#breaking-changes)
 - [License](#license)
 
 ---
@@ -261,6 +262,10 @@ Standards may emerge in two ways: the first way is that someone starts doing som
 
 These two ways of standardizing things are supported by this repository. Although the second is preferred, an effort will be made to codify standards emerged outside this repository into NIPs that can be later referenced and easily understood and implemented by others -- but obviously as in any human system discretion may be applied when standards are considered harmful.
 
+## Breaking Changes
+
+[Breaking Changes](BREAKING.md)
+
 ## License
 
 All NIPs are public domain.