74083f96c749e637befe819c250e79b0a0ba378a
hiram
  Wed Feb 8 11:25:29 2012 -0800
mention fetchChromSizes in these usage messages, redmine 6844
diff --git src/utils/bedGraphToBigWig/bedGraphToBigWig.c src/utils/bedGraphToBigWig/bedGraphToBigWig.c
index f9f09c3..fb37804 100644
--- src/utils/bedGraphToBigWig/bedGraphToBigWig.c
+++ src/utils/bedGraphToBigWig/bedGraphToBigWig.c
@@ -20,30 +20,32 @@
 static int itemsPerSlot = 1024;
 static boolean doCompress = FALSE;
 
 
 void usage()
 /* Explain usage and exit. */
 {
 errAbort(
   "bedGraphToBigWig v %d - Convert a bedGraph program to bigWig.\n"
   "usage:\n"
   "   bedGraphToBigWig in.bedGraph chrom.sizes out.bw\n"
   "where in.bedGraph is a four column file in the format:\n"
   "      <chrom> <start> <end> <value>\n"
   "and chrom.sizes is two column: <chromosome name> <size in bases>\n"
   "and out.bw is the output indexed big wig file.\n"
+  "Use the script: fetchChromSizes to obtain the actual chrom.sizes information\n"
+  "from UCSC, please do not make up a chrom sizes from your own information.\n"
   "The input bedGraph file must be sorted, use the unix sort command:\n"
   "  sort -k1,1 -k2,2 unsorted.bedGraph > sorted.bedGraph\n"
   "options:\n"
   "   -blockSize=N - Number of items to bundle in r-tree.  Default %d\n"
   "   -itemsPerSlot=N - Number of data points bundled at lowest level. Default %d\n"
   "   -unc - If set, do not use compression."
   , bbiCurrentVersion, blockSize, itemsPerSlot
   );
 }
 
 static struct optionSpec options[] = {
    {"blockSize", OPTION_INT},
    {"itemsPerSlot", OPTION_INT},
    {"unc", OPTION_BOOLEAN},
    {NULL, 0},