meowsum.git

diff --git a/meowsum.c b/meowsum.c
index c93b4311cd64d257815bed7eb9f6b589880e4d4c..94b05bc4b813a5a81c0160bfd9a3f5e081c85c78 100644
--- a/meowsum.c
+++ b/meowsum.c
@@ -16,10 +16,17 @@ #include 
 
 void print_usage() {
   printf("usage: meowsum [OPTION]... [FILE]...\n");
-  // -c -> read sums from FILE and check them
-  // -q -> when -c, only return status; do not print OK, FAIL(, MISSING)
-  // -e -> when -c, fail for missing files
-  // -s (32|64|*128) -> set hash size
+  printf("Print or check Meow hash checksums.\n");
+  printf("\n");
+  printf("When FILE is -, read standard input.\n");
+  printf("\n");
+  printf("  -c           read sums from the FILEs and check them\n");
+  printf("  -s size      set hash size; size can be 32, 64, 128 bits;\n");
+  printf("               the default is 128\n");
+  printf("\n");
+  printf("The following options are useful only when verifying checksums:\n");
+  printf("  -q           only return status; do not print OK, ERH, ERS, ERM\n");
+  printf("  -e           fail for missing files\n");
 }
 
 void parse_args(int argc, char *argv[], bool *quiet, bool *strict_error,