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# PR_INSERT_BEFORE
Inserts an element before another element in a circular list.
## Syntax
```{code}
#include <prclist.h>
PR_INSERT_BEFORE (
PRCList *elemp1
PRCList *elemp2);
```
### Parameters
`elemp1`
: A pointer to the element to be inserted.
`elemp2`
: A pointer to the element before which `elemp1` is to be inserted.
## Description
PR_INSERT_BEFORE inserts the element specified by `elemp1` into the
circular list, before the element specified by `elemp2`.