Add a tiny bit of help text to 'samtools depad' command.

diff --git a/padding.c b/padding.c
index 4061f247589dc641771b8b8da0bcba81475b49f3..6d97b1882a6f70ac6bca1d35f7b8217b0a02c926 100644 (file)
--- a/padding.c
+++ b/padding.c
@@ -181,6 +181,7 @@ int main_pad2unpad(int argc, char *argv[])
         int result=0;
        if (argc == 1) {
                fprintf(stderr, "Usage: samtools depad <in.bam>\n");
+               fprintf(stderr, "\nRequires embedded reference sequences (before the reads for that reference).\n");
                return 1;
        }
        in = strcmp(argv[1], "-")? bam_open(argv[1], "r") : bam_dopen(fileno(stdin), "r");