diff --git a/17.md b/17.md
index d22dbdef..43e095be 100644
--- a/17.md
+++ b/17.md
@@ -123,6 +123,11 @@ This NIP offers the following privacy and security features:
 
 The main limitation of this approach is having to send a separate encrypted event to each receiver. Group chats with more than 100 participants should find a more suitable messaging scheme.
 
+## NIP-19 entity
+To create an `nchat` link:
+  - `kind`: `17`
+  - `special`: one or more pubkeys concatenated
+
 ## Implementation
 
 Clients implementing this NIP should by default only connect to the set of relays found in their `kind:10050` list. From that they should be able to load all messages both sent and received as well as get new live updates, making it for a very simple and lightweight implementation that should be fast.
diff --git a/19.md b/19.md
index 3ea8e112..aaffc4b0 100644
--- a/19.md
+++ b/19.md
@@ -36,6 +36,7 @@ These are the possible bech32 prefixes with `TLV`:
   - `nevent`: a nostr event
   - `naddr`: a nostr _replaceable event_ coordinate
   - `nrelay`: a nostr relay (deprecated)
+  - `nchat`: a nostr chat conversation
 
 These possible standardized `TLV` types are indicated here:
 
@@ -44,6 +45,7 @@ These possible standardized `TLV` types are indicated here:
     - for `nprofile` it will be the 32 bytes of the profile public key
     - for `nevent` it will be the 32 bytes of the event id
     - for `naddr`, it is the identifier (the `"d"` tag) of the event being referenced. For normal replaceable events use an empty string.
+    - for `nchat`, see chat nip for details.
 - `1`: `relay`
   - for `nprofile`, `nevent` and `naddr`, _optionally_, a relay in which the entity (profile or event) is more likely to be found, encoded as ascii
   - this may be included multiple times
@@ -53,6 +55,7 @@ These possible standardized `TLV` types are indicated here:
 - `3`: `kind`
   - for `naddr`, the 32-bit unsigned integer of the kind, big-endian
   - for `nevent`, _optionally_, the 32-bit unsigned integer of the kind, big-endian
+  - for `nchat`, the NIP number of the chat.
 
 ## Examples
 
diff --git a/28.md b/28.md
index 16320880..a513ae4f 100644
--- a/28.md
+++ b/28.md
@@ -133,6 +133,11 @@ Clients MAY hide event 42s for users other than the user who sent the event 44.
 }
 ```
 
+## NIP-19 entity
+To create an `nchat` link:
+  - `kind`: `28`
+  - `special`: `id` from `kind: 40`
+
 ## Relay recommendations
 
 Clients SHOULD use the relay URLs of the metadata events.