## Comet parameter: add_C_cysteine

- Specify a static modification to the residue C.
- The specified mass is added to the unmodified mass of C.
- The default value is "0.0" if this parameter is missing. If Comet was compiled for Crux compatibility, the default value is "57.021464". Note that in the example parameter file produced by Comet using the "-p" command line option, this parameter entry has a value of 57.021464 for cysteine carbamidomethylation.

Example:
`add_C_cysteine = 57.021464`