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diff --git a/51.md b/51.md
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+NIP-51
+======
+
+Lists
+-------------------------
+
+`draft` `optional` `author:fiatjaf` `author:arcbtc` `author:monlovesmango` `author:eskema` `depends:33`
+
+A "list" event is defined as having a list of public and/or private tags. Public tags will be listed in the event `tags`. Private tags will be encrypted in the event `content`. Encryption for private tags will use [NIP-04 - Encrypted Direct Message](04.md) encryption, using the list author's private and public key for the shared secret. A distinct event kind should be used for each list type created. 
+
+If a list type should only be defined once per user (like the 'Mute' list), the list type's events should follow the specification for [NIP-16 - Replaceable Events](16.md). These lists may be referred to as 'replaceable lists'.
+
+Otherwise the list type's events should follow the specification for [NIP-33 - Parameterized Replaceable Events](33.md), where the list name will be used as the 'd' parameter. These lists may be referred to as 'parameterized replaceable lists'.
+
+## List Event Kinds
+
+| kind | list type                   | NIP           |
+|------|-----------------------------|---------------|
+| 10000| Mute                        | [51a](51a.md) |
+| 10001| Pin                         | [51b](51b.md) |
+| 30000| Categorized People          | [51c](51c.md) |
+| 30001| Categorized Bookmarks       | [51d](51d.md) |
+## Replaceable List Event Example
+
+Lets say a user wants to create a 'Mute' list and has keys:
+```
+priv: fb505c65d4df950f5d28c9e4d285ee12ffaf315deef1fc24e3c7cd1e7e35f2b1
+pub: b1a5c93edcc8d586566fde53a20bdb50049a97b15483cb763854e57016e0fa3d 
+```
+The user wants to publicly include these users:
+
+```json
+["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
+["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"]
+```
+and privately include these users (below is the JSON that would be encrypted and placed in the event content):
+
+```json
+[
+    ["p", "9ec7a778167afb1d30c4833de9322da0c08ba71a69e1911d5578d3144bb56437"],
+    ["p", "8c0da4862130283ff9e67d889df264177a508974e2feb96de139804ea66d6168"]
+]
+```
+
+Then the user would create a 'Mute' list event like below:
+
+```json
+{
+  "kind": 10000,
+  "tags": [
+    ["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
+    ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
+  ],
+  "content": "VezuSvWak++ASjFMRqBPWS3mK5pZ0vRLL325iuIL4S+r8n9z+DuMau5vMElz1tGC/UqCDmbzE2kwplafaFo/FnIZMdEj4pdxgptyBV1ifZpH3TEF6OMjEtqbYRRqnxgIXsuOSXaerWgpi0pm+raHQPseoELQI/SZ1cvtFqEUCXdXpa5AYaSd+quEuthAEw7V1jP+5TDRCEC8jiLosBVhCtaPpLcrm8HydMYJ2XB6Ixs=?iv=/rtV49RFm0XyFEwG62Eo9A==",
+  ...other fields
+}
+```
+
+
+## Parameterized Replaceable List Event Example
+
+Lets say a user wants to create a 'Categorized People' list of `nostr` people and has keys:
+```
+priv: fb505c65d4df950f5d28c9e4d285ee12ffaf315deef1fc24e3c7cd1e7e35f2b1
+pub: b1a5c93edcc8d586566fde53a20bdb50049a97b15483cb763854e57016e0fa3d 
+```
+The user wants to publicly include these users:
+
+```json
+["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
+["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"]
+```
+and privately include these users (below is the JSON that would be encrypted and placed in the event content):
+
+```json
+[
+    ["p", "9ec7a778167afb1d30c4833de9322da0c08ba71a69e1911d5578d3144bb56437"],
+    ["p", "8c0da4862130283ff9e67d889df264177a508974e2feb96de139804ea66d6168"]
+]
+```
+
+Then the user would create a 'Categorized People' list event like below:
+
+```json
+{
+  "kind": 30000,
+  "tags": [
+    ["d", "nostr"],
+    ["p", "3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d"],
+    ["p", "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"],
+  ],
+  "content": "VezuSvWak++ASjFMRqBPWS3mK5pZ0vRLL325iuIL4S+r8n9z+DuMau5vMElz1tGC/UqCDmbzE2kwplafaFo/FnIZMdEj4pdxgptyBV1ifZpH3TEF6OMjEtqbYRRqnxgIXsuOSXaerWgpi0pm+raHQPseoELQI/SZ1cvtFqEUCXdXpa5AYaSd+quEuthAEw7V1jP+5TDRCEC8jiLosBVhCtaPpLcrm8HydMYJ2XB6Ixs=?iv=/rtV49RFm0XyFEwG62Eo9A==",
+  ...other fields
+}
+```
+
+
diff --git a/51a.md b/51a.md
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+NIP-51a
+======
+
+Mute List
+-------------------------
+
+`draft` `optional` `author:fiatjaf` `author:arcbtc` `author:monlovesmango` `author:eskema` 
+
+An event with kind `10000` is defined as a replaceable list event (see [NIP-51 - Lists](51.md) for listing content a user wants to mute. Any standarized tag can be included in a Mute List.
\ No newline at end of file
diff --git a/51b.md b/51b.md
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+NIP-51b
+======
+
+Pin List
+-------------------------
+
+`draft` `optional` `author:fiatjaf` `author:arcbtc` `author:monlovesmango` `author:eskema` 
+
+An event with kind `10001` is defined as a replaceable list event (see [NIP-51 - Lists](51.md) for listing content a user wants to pin. Any standarized tag can be included in a Pin List.
\ No newline at end of file
diff --git a/51c.md b/51c.md
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+NIP-51c
+======
+
+Categorized People List
+-------------------------
+
+`draft` `optional` `author:fiatjaf` `author:arcbtc` `author:monlovesmango` `author:eskema` 
+
+An event with kind `30000` is defined as a parameterized replaceable list event (see [NIP-51 - Lists](51.md)) for categorizing people. The 'd' parameter for this event holds the category name of the list. The tags included in these lists MUST follow the format of kind 3 events as defined in [NIP-02 - Contact List and Petnames](02.md).
\ No newline at end of file
diff --git a/51d.md b/51d.md
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+NIP-51c
+======
+
+Categorized Bookmarks List
+-------------------------
+
+`draft` `optional` `author:fiatjaf` `author:arcbtc` `author:monlovesmango` `author:eskema` 
+
+An event with kind `30001` is defined as a parameterized replaceable list event (see [NIP-51 - Lists](51.md)) for categorizing bookmarks. The 'd' parameter for this event holds the category name of the list. Any standarized tag can be included in a Categorized Bookmarks List.
\ No newline at end of file
diff --git a/README.md b/README.md
index 42674cc..544a6b2 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 - [NIP-42: Authentication of clients to relays](42.md)
 - [NIP-46: Nostr Connect](46.md)
 - [NIP-50: Keywords filter](50.md)
+- [NIP-51: Lists](51.md)
 - [NIP-56: Reporting](56.md)
 - [NIP-57: Lightning Zaps](57.md)
 - [NIP-58: Badges](58.md)
@@ -39,6 +40,7 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 - [NIP-78: Application-specific data](78.md)
 
 ## Event Kinds
+
 | kind          | description                      | NIP         |
 | ------------- | -------------------------------- | ----------- |
 | 0             | Metadata                         | [1](01.md)  |
@@ -57,9 +59,13 @@ NIPs stand for **Nostr Implementation Possibilities**. They exist to document wh
 | 1984          | Reporting                        | [56](56.md) |
 | 9734          | Zap Request                      | [57](57.md) |
 | 9735          | Zap                              | [57](57.md) |
+| 10000         | Mute List                        | [51](51.md) |
+| 10001         | Pin List                         | [51](51.md) |
 | 10002         | Relay List Metadata              | [65](65.md) |
 | 22242         | Client Authentication            | [42](42.md) |
 | 24133         | Nostr Connect                    | [46](46.md) |
+| 30000         | Categorized People List          | [51](51.md) |
+| 30001         | Categorized Bookmark List        | [51](51.md) |
 | 30008         | Profile Badges                   | [58](58.md) |
 | 30009         | Badge Definition                 | [58](58.md) |
 | 30023         | Long-form Content                | [23](23.md) |