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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This is a tiny program which will output a binary [PGM](https://wikipedia.org/wi
 
 ## Syntax
 
-	./mandelbrot-gen -c size -i max_iterations [-e exponent] \
+	./mandelbrot-gen -s size -i max_iterations [-e exponent] \
 	                 [-c cores] [-t thread_multiplier]
 	                 [-N cluster-id -T cluster-total] > output.pgm