# Customize the name of a flow block in Connect Customer
<a name="set-custom-flow-block-name"></a>

To help you distinguish blocks in a flow, you can customize the names of blocks. For example, when there are multiple **Play prompt** blocks, and you want to distinguish between them at a glance you can assign each block their own name. 

Custom flow block names appear in CloudWatch logs under the `Identifier` field. This makes it easier for you to review the logs to diagnose issues.

**Important**  
The following characters are not allowed in the block name or `Identifier` field: (% : ( \\ / ) = $ , ; [ ] { })
The following strings are not allowed in the block name or `Identifier` field: \_\_proto\_\_, constructor, \_\_defineGetter\_\_, \_\_defineSetter\_\_, toString, hasOwnProperty, isPrototypeOf, propertyIsEnumerable, toLocaleString, and valueOf. 

There are two ways you can specify a custom block name:
+ On the block, choose **...**, and then choose **Add block name**, as shown in the following GIF.  
![A block with a custom name.](http://docs.aws.amazon.com/connect/latest/adminguide/images/set-custom-flow-block-name-1.gif)
+ You can also customize the name of the block on the **Property** page, as shown in the following GIF.  
![A block with a custom name.](http://docs.aws.amazon.com/connect/latest/adminguide/images/set-custom-flow-block-name-2.gif)