diff --git a/lib/mastodon/ip_blocks_cli.rb b/lib/mastodon/ip_blocks_cli.rb
index 8a8685fe5..82a08753b 100644
--- a/lib/mastodon/ip_blocks_cli.rb
+++ b/lib/mastodon/ip_blocks_cli.rb
@@ -11,7 +11,7 @@ module Mastodon
       true
     end
 
-    option :severity, required: true, enum: %w(no_access sign_up_requires_approval), desc: 'Severity of the block'
+    option :severity, required: true, enum: %w(no_access sign_up_requires_approval sign_up_block), desc: 'Severity of the block'
     option :comment, aliases: [:c], desc: 'Optional comment'
     option :duration, aliases: [:d], type: :numeric, desc: 'Duration of the block in seconds'
     option :force, type: :boolean, aliases: [:f], desc: 'Overwrite existing blocks'