diff --git a/experimental/chatproto/packages/lexicon/src/lexicons.ts b/experimental/chatproto/packages/lexicon/src/lexicons.ts
index ead3f9e..045f06c 100644
--- a/experimental/chatproto/packages/lexicon/src/lexicons.ts
+++ b/experimental/chatproto/packages/lexicon/src/lexicons.ts
@@ -1345,11 +1345,20 @@ export const schemaDict = {
         description: 'Get a list of the most recent messages on the network.',
         parameters: {
           type: 'params',
+          required: ['channelNsid'],
           properties: {
+            channelNsid: {
+              type: 'string',
+              format: 'nsid',
+            },
             before: {
               type: 'string',
               format: 'tid',
             },
+            hintChannelOwner: {
+              type: 'string',
+              format: 'at-identifier',
+            },
           },
         },
         output: {
diff --git a/experimental/chatproto/packages/lexicon/src/types/app/andref/chatproto/getMessages.ts b/experimental/chatproto/packages/lexicon/src/types/app/andref/chatproto/getMessages.ts
index 06d1a53..40dea62 100644
--- a/experimental/chatproto/packages/lexicon/src/types/app/andref/chatproto/getMessages.ts
+++ b/experimental/chatproto/packages/lexicon/src/types/app/andref/chatproto/getMessages.ts
@@ -14,7 +14,9 @@ const is$typed = _is$typed,
 const id = 'app.andref.chatproto.getMessages'
 
 export interface QueryParams {
+  channelNsid: string
   before?: string
+  hintChannelOwner?: string
 }
 
 export type InputSchema = undefined