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### 3.4 Defining Label Environments

RefTeX can be configured to recognize additional labeled environments and macros. This is done with the variable reftex-label-alist (see Options (Defining Label Environments)). If you are not familiar with Lisp, you can use the custom library to configure this rather complex variable. To do this, use

     M-x customize-variable <RET> reftex-label-alist <RET>


Here we will discuss a few examples, in order to make things clearer. It can also be instructive to look at the constant reftex-label-alist-builtin which contains the entries for all the builtin environments and macros (see Builtin Label Environments).