diff --git a/config.yaml.example b/config.yaml.example
index 1467ea9..8dc8ec0 100644
--- a/config.yaml.example
+++ b/config.yaml.example
@@ -4,19 +4,22 @@ storage_dir: files
 http_host: '127.0.0.1'
 http_port: 8380
 
-# domain name
+# Domain name
 instance_uri: myserver.net
 instance_title: myserver
 instance_short_description: my fedi instance
 # Long description can contain markdown syntax
 instance_description: my fedi instance
+
 # RSA private key can be generated with `mitractl generate-rsa-key`
 instance_rsa_key: null
 registrations_open: false
-# Login message must contain instance URL
-login_message: 'Sign this message to log in to https://myserver.net. Do not sign this message on other sites!'
+# EIP-4361 login message
+login_message: 'Do not sign this message on other sites!'
+post_character_limit: 2000
 
-# To disable blockchain integration, set `blockchain` to `null`
+# Blockchain settings
+# Set `blockchain` key to `null` to disable blockchain integration
 blockchain:
   # CAIP-2 chain ID (https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-2.md)
   chain_id: eip155:31337
@@ -28,6 +31,8 @@ blockchain:
   # Instance private key
   signing_key: null
 
+# IPFS settings
+# Set `ipfs_api_url` key to `null` to disable IPFS integration
 ipfs_api_url: 'http://127.0.0.1:5001'
 # IPFS gateway for clients
 ipfs_gateway_url: 'https://ipfs.io'
diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index bb60f47..2f64ad5 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -19,7 +19,6 @@ paths:
                   type: string
                   enum:
                     - password
-                    - ethereum
                     - eip4361
                   example: eip4361
                 username:
@@ -33,12 +32,8 @@ paths:
                   description: EIP-4361 signature (required if grant type is "eip4361").
                   type: string
                   example: 0x905...
-                wallet_address:
-                  description: Ethereum wallet address (required if grant type is "ethereum").
-                  type: string
-                  example: null
                 password:
-                  description: Password (required if grant type is "password" or "ethereum").
+                  description: Password (required if grant type is "password").
                   type: string
                   example: null
               required:
diff --git a/src/config.rs b/src/config.rs
index c5a1e39..8acc48c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -120,6 +120,7 @@ pub struct Config {
     #[serde(default)]
     pub registrations_open: bool, // default is false
 
+    // EIP-4361 login message
     pub login_message: String,
 
     #[serde(default = "default_post_character_limit")]
diff --git a/src/mastodon_api/oauth/views.rs b/src/mastodon_api/oauth/views.rs
index 34b2668..eb70726 100644
--- a/src/mastodon_api/oauth/views.rs
+++ b/src/mastodon_api/oauth/views.rs
@@ -33,6 +33,7 @@ async fn token_view(
             get_user_by_name(db_client, username).await?
         },
         "ethereum" => {
+            // DEPRECATED
             let wallet_address = request_data.wallet_address.as_ref()
                 .ok_or(ValidationError("wallet address is required"))?;
             validate_wallet_address(wallet_address)?;