Add comment for compression level

Author: marcprux

Sources/SkipZip/SkipZip.swift

@@ -178,8 +178,7 @@ public final class ZipWriter {
     ///   - path: the path in the zip file to write to
     ///   - data: the data to add
     ///   - comment: an optional comment for the entry
-    ///   - compression: the compression mode
-    ///   - level: the compression level to use
+    ///   - compression: the compression level to use, where 0 is no compression (STORE), and 1-9 is in order of increasing compression (DEFLATE), and -1 is the default level (6)
     public func add(path: String, data: Data, comment: String? = nil, compression: Int?) throws {
         try check(minizip.zipOpenNewFileInZip_64(file: file, filename: path, zipfi: nil, extrafield_local: nil, size_extrafield_local: FFIUInt16(0), extrafield_global: nil, size_extrafield_global: FFIUInt16(0), comment: comment, compression_method: compression == nil ? CompressionMethod.store.rawValue : CompressionMethod.deflate.rawValue, level: Int32(compression ?? 0), zip64: Int32(1)))