add favorite scrolls list.

51.md

@@ -33,6 +33,7 @@ For example, _mute list_ can contain the public keys of spammers and bad actors
 | Search relays     | 10007 | relays clients should use when performing search queries    | `"relay"` (relay URLs)                                                                              |
 | Simple groups     | 10009 | [NIP-29](29.md) groups the user is in                       | `"group"` ([NIP-29](29.md) group id + relay URL + optional group name), `"r"` for each relay in use |
 | Relay feeds       | 10012 | user favorite browsable relays (and relay sets)             | `"relay"` (relay URLs) and `"a"` (kind:30002 relay set)                                             |
+| Favorite scrolls  | 10013 | user favorite scrolls                                       | `"e"` (kind:1227 scroll events)                                                                    |
 | Interests         | 10015 | topics a user may be interested in and pointers             | `"t"` (hashtags) and `"a"` (kind:30015 interest set)                                                |
 | Media follows     | 10020 | multimedia (photos, short video) follow list                | `"p"` (pubkeys -- with optional relay hint and petname)                                             |
 | Emojis            | 10030 | user preferred emojis and pointers to emoji sets            | `"emoji"` (see [NIP-30](30.md)) and `"a"` (kind:30030 emoji set)                                    |

A5.md

@@ -24,6 +24,10 @@ This NIP defines a standard for publishing self-contained WebAssembly programs a
 }
 ```
 
+## Favorite scrolls list
+
+Clients can publish a list of favorite scrolls using a NIP-51 standard list event with kind `10013`. The list should include one `"e"` tag per scroll event (kind `1227`).
+
 ## String Convention
 
 Unless noted otherwise (for hex pubkeys and ids), the module passes strings to the host as `(ptr: i32, len: i32)` pairs into its linear memory. The host returns strings (and other variable-length data) by returning an `i32` pointer to a buffer in linear memory whose first 4 bytes are the `u32_be` byte-length of the payload that follows.
@@ -36,6 +40,8 @@ In order to keep the size of WASM programs small (<10kb) we recommend not includ
 
 Because of this the WASM program is expected to expose just a simple `alloc()` function to the host, which is used for the host to know a place it can write things to. No function capable of freeing memory is expected.
 
+Hosts are encouraged to enforce resource limits for scroll execution, including memory consumption, number of open handles, and CPU usage.
+
 ---
 
 ## Global Exports