Updated readme according to selectable thread count

1 files changed, 8 insertions, 5 deletions

diff --git a/README.md b/README.md
index 271c185..c0b8cc5 100644
--- a/README.md
+++ b/README.md
@@ -2,18 +2,21 @@ Fractal Gen
 ==========
 This is a tiny program which will output a binary [PGM](https://wikipedia.org/wiki/Netpbm_format#PGM_example) format square image of a mandelbrot or burning ship set.
 
-Just invoke it like 
 
-	./mbrot-gen 1000 100 2 > image.pgm
+Syntax
+------
 
-For a 1000x1000 point image of a mandelbrot set using 100 iterations and an exponent of 2.
+    ./mbrot-gen <size> <max_iterations> <power> [threads] > output.pgm
+
+You might then want to consider using a tool such as ImageMagick to then convert the (large) output file into something more sane like a PNG.
 For the clich&eacute; set you'll want to keep the exponent at 2.
+For more info on the exponent, read through [Wikipedia's fine article](http://wikipedia.org/wiki/Mandelbrot_set).
 
 Notes
 -----
 
-1. This has your CPU over a barrel.
+1. By default, this has your CPU over a barrel.
    It spawns as many threads as you have cores, so have fun with that.
-   I'm looking at adding an option to override the number of threads.
+   You can specify the number of threads you want it to (see syntax).
 
 2. PGMs are grayscale, so you might want to tint it or apply a pallete of sort.