Index: lib/auto_migrations.rb
===================================================================
--- lib/auto_migrations.rb	(revision 413)
+++ lib/auto_migrations.rb	(working copy)
@@ -104,12 +104,15 @@
     def auto_add_index(method, *args, &block)      
       table_name = args.shift.to_s
       fields     = Array(args.shift).map(&:to_s)
-      index_name = "index_#{table_name}_on_#{fields.join('_and_')}"
-      
+      options    = args.shift
+
+      index_name = options[:name] if options  
+      index_name ||= "index_#{table_name}_on_#{fields.join('_and_')}"
+
       (self.indexes_in_schema ||= []) << index_name
       
       unless ActiveRecord::Base.connection.indexes(table_name).detect { |i| i.name == index_name }
-        method_missing_without_auto_migration(method, *[table_name, fields], &block)
+        method_missing_without_auto_migration(method, *[table_name, fields, options], &block)
       end
     end