readme update

README.md

@@ -36,15 +36,34 @@ The standard cmake routine:
 
 ## Usage
 
-    Usage: ./justify [OPTION]...
+		Usage: ./justify [OPTION]...
 
-      -i,--input [FILE]   Input file to process, defaults to stdin.
-      -o,--output [FILE]  Output file, defaults to stdout.
-      -c,--cols [NUM]     Text width to format text into.
-                      (defaults to terminal width)
-      -a,--align [center|fill|left|right]
-                          Justify method (default=fill).
-      -h,--help           Show this help text.
+		Input / output options:
+
+		  -i,--input [FILE]     Input file to process, defaults to stdin.
+		  -o,--output [FILE]    Output file, defaults to stdout.
+
+		Column options:
+
+		  -c,--cols [COLS]      Number of columns for multi-column
+								output.
+		  -s,--hspacing [COLS]  Column horizontal spacing.
+								(default: 2)
+		  -v,--vspacing [ROWS]  Column vertical spacing.
+								(default: 1)
+		  -m,--colheight [ROWS] Column max. height.
+								(default: 0, =infinite)
+
+		Alignment options: 
+
+		  -w,--width [NUM]      Text width to format text into.
+								(defaults to terminal width)
+		  -a,--align [center|fill|left|right]
+								Justify method (default=fill).
+
+		Misc options: 
+
+		  -h,--help             Show this help text.
 
 ## Screenshots