# PCAppendOptionsPrefix
Appends to the prefix used for searching for all `PC` options in the database. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCAppendOptionsPrefix(PC pc, const char prefix[])
```
Logically Collective


## Input Parameters

- ***pc -*** the preconditioner context
- ***prefix -*** the prefix string to prepend to all `PC` option requests



## Note
A hyphen (-) must NOT be given at the beginning of the prefix name.
The first character of all runtime options is AUTOMATICALLY the
hyphen.




## See Also
 `PC`, `PCSetFromOptions`, `PCSetOptionsPrefix()`, `PCGetOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/interface/precon.c.html#PCAppendOptionsPrefix">src/ksp/pc/interface/precon.c</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/interface/precon.c)


[Index of all PC routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
