diff --git a/README.md b/README.md
index a89dd92..92e8f84 100644
--- a/README.md
+++ b/README.md
@@ -437,26 +437,16 @@ const newPeers = await client.offers.findByTopic('movie-xyz', {
 
 ### Authentication
 
-#### `client.register(customPeerId?)`
+#### `client.register()`
 Register a new peer and receive credentials.
 
+Generates a cryptographically random 128-bit peer ID.
+
 ```typescript
-// Auto-generate peer ID
 const creds = await client.register();
 // { peerId: 'f17c195f067255e357232e34cf0735d9', secret: '...' }
-
-// Or use a custom peer ID (1-128 characters)
-const customCreds = await client.register('my-custom-peer-id');
-// { peerId: 'my-custom-peer-id', secret: '...' }
 ```
 
-**Parameters:**
-- `customPeerId` (optional): Custom peer ID (1-128 characters). If not provided, a random ID will be generated.
-
-**Notes:**
-- Returns 409 Conflict if the custom peer ID is already in use
-- Custom peer IDs must be non-empty and between 1-128 characters
-
 ### Topics
 
 #### `client.offers.getTopics(options?)`