meowsum.git

diff --git a/meowsum.1.scd b/meowsum.1.scd
index 8512c03cc13ef3a1eb9590f66ad79e7cae7abf74..e7ef0a380790be3e4782b4a1365804492148ab92 100644
--- a/meowsum.1.scd
+++ b/meowsum.1.scd
@@ -14,11 +14,12 @@ meowsum [-s size] FILE...
 
 # DESCRIPTION
 
-The meowsum utility calculates and prints or checks Meow hash checksums.
+The meowsum utility calculates and prints or verifies Meow hash checksums.
 The output format is consistent with POSIX cksum; meowsum prints the checksum,
 number of bytes, and file path to standard output.
 
 When FILE is -, meowsum reads standard input.
+Checksums calculated from standard input are skipped when verifying.
 
 # OPTIONS
 
@@ -30,6 +31,28 @@
 The following options are useful only when verifying checksums:++
 \-q           only return status; do not print OK, ERH, ERS, ERM++
 \-e           fail for missing files
+
+# OUTPUT
+
+When calculating checksums, for each FILE one line is printed to standard
+output:
+```
+CHECKSUM SIZE FILE
+```
+where CHECKSUM is hexadecimal digest of calculated checksum, and SIZE is number
+of bytes in the file.
+
+When verifying checksums, errors are printed to stderr, and, unless there has
+been and error, for each line in each FILE one line is printed to standard
+output:
+```
+STATUS FILE
+```
+where STATUS is:
+- OK - if checksum and size are correct
+- ERM - if file is missing
+- ERH - if checksum is not correct
+- ERS - if checksum is correct but size is not
 
 # AUTHORS
 




diff --git a/meowsum.c b/meowsum.c
index 3c69bd7477be179a16b1e7d8178dc25532f1caaf..1e55a25fc29618a2c0b752d3540d12b7010fabee 100644
--- a/meowsum.c
+++ b/meowsum.c
@@ -19,7 +19,7 @@ #include 
 #include <unistd.h>
 
 void print_usage() {
-  printf("usage: meowsum [OPTION]... [FILE]...\n");
+  printf("usage: meowsum [OPTION]... FILE...\n");
   printf("Print or check Meow hash checksums.\n");
   printf("\n");
   printf("When FILE is -, read standard input.\n");