- * Compression type for which to set the default compression level. Or, if
- * this is the special value -1, the default compression levels for all
- * known compression types will be set.
+ * Compression type for which to set the default compression level, as one
+ * of the ::wimlib_compression_type constants. Or, if this is the special
+ * value -1, the default compression levels for all known compression types
+ * will be set.