added more some comments

skratch.c

@@ -127,27 +127,29 @@ int main(int argc, char *argv[])
 	int opt;
 	struct Flags f = {.use_v = 0, .filename="skratch-XXXXXX"};
 	make_skratch_path(&f);
+	//handle args
 	while ((opt = getopt(argc, argv, "cls:v")) != -1)
 	{
 		switch (opt)
 		{
-			case 'c':
+			case 'c': // delete ~/.skratch files
 				delete_files(&f);
 				return 0;
-			case 'l':
+			case 'l': // list ~/.skratch files
 				list_files(&f, 0);
 				return 0;
-			case 's':
+			case 's': // use file suffix, like .txt
 				f.use_s = 1;
 				f.suffix = optarg;
 				break;
-			case 'v':
+			case 'v': // use visual editor
 				f.use_v = 1;
 				break;
 			default:
 				printf("error print usage");
 		}
 	}
+	// find optional filename if exists
 	for (int i = optind; i < argc; i++)
 	{
 		if (!strcmp(f.filename,"skratch-XXXXXX"))