1 files changed, 17 insertions, 0 deletions

diff --git a/README.md b/README.md
index 1576965..1ef0ec8 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 - [NIP-16: Event Treatment](16.md)
 - [NIP-19: bech32-encoded entities](19.md)
 - [NIP-20: Command Results](20.md)
+- [NIP-21: `nostr:` URL scheme](21.md)
 - [NIP-22: Event created_at Limits](22.md)
 - [NIP-25: Reactions](25.md)
 - [NIP-26: Delegated Event Signing](26.md)
@@ -49,6 +50,8 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 | 22242       | Client Authentication       | [42](42.md)            |
 | 10000-19999 | Replaceable Events Reserved | [16](16.md)            |
 | 20000-29999 | Ephemeral Events Reserved   | [16](16.md)            |
+| 30000-39999 | Param. Repl. Events Reserved| [33](33.md)            |
+
 
 
 ## Message types
@@ -74,6 +77,20 @@ Please update these lists when proposing NIPs introducing new event kinds.
 
 When experimenting with kinds, keep in mind the classification introduced by [NIP-16](16.md).
 
+## Standardized Tags
+
+| name       | value                   | other parameters  | NIP                      |
+| ---------- | ----------------------- | ----------------- | ------------------------ |
+| e          | event id (hex)          | relay URL, marker | [1](01.md), [10](10.md)  |
+| p          | pubkey (hex)            | relay URL         | [1](01.md)               |
+| r          | a reference (URL, etc)  |                   | [12](12.md)              |
+| t          | hashtag                 |                   | [12](12.md)              |
+| g          | geohash                 |                   | [12](12.md)              |
+| nonce      | random                  |                   | [13](13.md)              |
+| subject    | subject                 |                   | [14](14.md)              |
+| d          | identifier              |                   | [33](33.md)              |
+| expiration | unix timestamp (string) |                   | [40](40.md)              |
+
 ## Criteria for acceptance of NIPs
 
 1. They should be implemented in at least two clients and one relay -- when applicable.