updated readme

README.md

@@ -8,19 +8,18 @@ It computes [crc32s,][crc] and what of it?
 Usage
 ----
 ```
-crc32 - 32-bit cyclic redundancy check calculator
+crc32 - a 32-bit cyclic rendundancy check calculator
 
-  -h, --help             display this text
-      --license          show copyright & license information
-  -i, --input f          open file f for reading (default: stdin)
-  -s, --start-at n       start cycle with n (default: 0xFFFFFFFF)
-  -p, --polynomial n     use n as the crc divisor (default: 0x04C11DB7)
-  -e, --big-endian       use big endian calculations (default: little)
-  -b, --binary           output as binary (default: hex with newline)
-  -x, --xor              xor the output by 0xFFFFFFFF
-  -r, --reflect          reverse the bits of the output
+  <files...>        open files as inputs
+  -h                display this text
+  -s <n>            start cycle with n (default: 0xFFFFFFFF)
+  -p <n>            use n as the crc divisor (default: 0x04C11DB7)
+  -e                use big endian calculations
+  -b                output as binary
+  -x                NOT the output
+  -r                reverse output's bits
 
-numbers (n) may be entered as hexadecimal or octal with prefixes
+numbers <n> may be entered as hexadecimal or octal with prefixes
 ```
 
 Notes