fixed readme

README.md

@@ -1,12 +1,13 @@
 crc32
------
+=====
 
-A [crc32][crc] calculator written in C and licensed under GPLv3.
+A [crc32][crc] calculator written in C and licensed under the [GPLv3 license.][gpl]
 
-[crc]: http://en.wikipedia.org/wiki/Cyclic_redundancy_check "cycle redundancy check on wikipedia"
+[crc]: http://en.wikipedia.org/wiki/Cyclic_redundancy_check
+[gpl]: http://www.gnu.org/licenses/gpl.txt
 
 Compilation
-===========
+-----------
 
 	gcc -ansi -pedantic -Wall -Werror -O3 main.c -o crc32
 
@@ -15,12 +16,21 @@ or for Visual Studio users
 	cl /O2 /Ot /W2 /WX /Fecrc32 main.c
 
 Help
-====
+----
 
+	  -h, --help             display this text
+	  -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 for crc calculations (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
 	
+	numbers (n) can be entered as hexadecimal or octal with prefixes
 
 Notes
-=====
+-----
 
-*	Defaults to comply to IEEE-802.3 specs.
+*	Does not pad input.
 *	Big endian calculations may not be accurate. I'll look into this.