docs/indexes.md in postgres_ext-0.2.2 vs docs/indexes.md in postgres_ext-0.3.0

@@ -4,16 +4,25 @@
 
 Postgres\_ext allows you to specify index type and index operator
 class at index creation.
 
 ```ruby
-add_index :table_name, :column, :index_type => :gin
-add_index :table_name, :column, :index_type => :gin, :index_opclass => :gin_trgm_ops
+add_index :table_name, :column, :using => :gin
+add_index :table_name, :column, :using => :gin, :index_opclass => :gin_trgm_ops
 ```
 
 ## Where clauses
 
 Postgres\_ext allows you to specify a where clause at index creation.
 
 ```ruby
 add_index :table_name, :column, :where => 'column < 50'
+```
+
+## Concurrent Indexes
+
+Postgres\_ext allows you to create indexes concurrently using the
+`:algorithm` option
+
+```ruby
+add_index :table_name, :column, :algorithm => :concurrently
 ```