Wrap using in a back ticks to indicate code.

README.mkdn

@@ -64,13 +64,13 @@ First, you need to create a config file, shards.yml, inside your config/ directo
 
 ### Syntax
 
-Octopus adds a method to each AR Class and object: the using method is used to select the shard like this:
+Octopus adds a method to each AR Class and object: the `using` method is used to select the shard like this:
 
 ```ruby
 User.where(:name => "Boba").limit(3).using(:read_replica_one)
 ```
 
-Octopus also supports queries within a block. When you pass a block to the using method, all queries inside the block will be sent to the specified shard.
+Octopus also supports queries within a block. When you pass a block to the `using` method, all queries inside the block will be sent to the specified shard.
 
 ```ruby
 Octopus.using(:read_replica_two) do
@@ -110,7 +110,7 @@ Each model instance knows which shard it came from so this will work automatical
 
 ### Migrations
 
-In migrations, you also have access to the using method. The syntax is basically the same. This migration will run in the brazil and canada shards.
+In migrations, you also have access to the `using` method. The syntax is basically the same. This migration will run in the brazil and canada shards.
 
 ```ruby
 class CreateUsersOnBothShards < ActiveRecord::Migration