diff --git a/sch2fig/main.c b/sch2fig/main.c
index 5920a9b..7e02d0e 100644
--- a/sch2fig/main.c
+++ b/sch2fig/main.c
@@ -42,17 +42,37 @@ static struct gfx_ops const *ops_list[] = {
 void usage(const char *name)
 {
 	fprintf(stderr,
-"usage: %s [-r] [-v ...] [file.lib ...] file.sch -- driver_spec\n"
-"       %s [-v ...] -C file\n\n"
-"  FIG driver spec:\n"
-"    fig [-t template.fig] [var=value ...]\n"
-"  Cairo PNG driver spec:\n"
-"    png [-o output.png] [-s scale]\n"
-"  Cairo PDF driver spec:\n"
-"    pdf [-o output.pdf] [-s scale]\n"
-"  Diff driver spec:\n"
-"    diff [-o output.pdf] [-s scale] [file.lib ...] file.sch\n"
-    , name, name);
+"usage: %s [-r] [-v ...] [[rev:]file.lib ...] [rev:]file.sch\n"
+"       %*s-- driver_spec\n"
+"       %s [-v ...] -C [rev:]file\n"
+"\n"
+"  rev  git revision\n"
+"  -r   recurse into sub-sheets\n"
+"  -v   increase verbosity of diagnostic output\n"
+"  -C   'cat' the file to standard output\n"
+"\n"
+"FIG driver spec:\n"
+"  fig [-t template.fig] [var=value ...]\n"
+"\n"
+"  var=value        substitute \"<var>\" with \"value\" in template\n"
+"  -t template.fig  merge this file with generated output\n"
+"\n"
+"Cairo PNG driver spec:\n"
+"  png [-o output.png] [-s scale]\n"
+"\n"
+"  -o output.png  generate PNG output and write to specified file\n"
+"  -s scale       scale by indicated factor (default: 1.0)\n"
+"\n"
+"Cairo PDF driver spec:\n"
+"  pdf [-o output.pdf] [-s scale]\n"
+"\n"
+"  see PNG\n"
+"\n"
+"Diff driver spec:\n"
+"  diff [-o output.pdf] [-s scale] [file.lib ...] file.sch\n"
+"\n"
+"  see PNG\n"
+    , name, (int) strlen(name) + 1, "", name);
 	exit(1);
 }